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Perm & comb Dpp (1-10) F-Only (WA).pdf

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1. CLASS : XII-F DPP. NO.– P & C - (1 to 10) ELEMENTARY PROBLEMS ON PERMUTATION & COMBINATION NOTE : USE FUNDAMENTAL PRINCIPLE OF COUNTING & ENJOY DOING THE FOLLOWING. Q.1 In how many ways can clean & clouded (overcast) days occur in a week assuming that an entire day is either clean or clouded. Q.2 Four visitors A , B , C & D arrive at a town which has 5 hotels . In how many ways can they disperse themselves among 5 hotels , if 4 hotels are used to accommodate them. Q.3 If the letters of the word “VARUN” are written in all possible ways and then are arranged as in a dictionary, then therank of the wordVARUN is : (A) 98 (B) 99 (C) 100 (D) 101 Q.4 How many natural numbers are their from 1 to 1000 which have none of their digits repeated. Q.5 A man has 3 jackets, 10 shirts, and 5 pairs of slacks. If an outfit consists of a jacket, a shirt, and a pair of slacks, howmany different outfits canthe man make? Q.6 There are 6 roads between A & B and 4 roads between B & C. (i) In how many ways can one drive from A to C by way of B ? (ii) In how many ways can one drive from A to C and back to A, passing through B on both trips ? (iii) Inhowmany wayscan onedrive the circular tripdescribedin (ii)withoutusing the sameroadmore than once. Q.7(i) How many car number plates can be made if each plate contains 2 different letters of English alphabet, followed by 3 different digits. (ii) Solve the problem, if the first digit cannot be 0. (Do not simplify) Q.8(i) Find thenumber of four letter word that can beformed from the letters of theword HISTORY. (each letter to be used at most once) (ii) How many of them contain only consonants? (iii) How many of them begin & endin a consonant? (iv) How many of them begin with a vowel ? (v) How many containthe letters Y ? (vi) How many begin with T & end in a vowel ? (vii) How many begin with T & also contain S ? (viii) How many contain both vowels ? SPECIAL DPP ON PERMUTATION AND COMBINATION MATHEMATICS Daily Practice Problems
2. Q.9 If repetitions are not permitted (i) How many 3 digit numbers can be formed from the six digits 2, 3, 5, 6, 7 & 9? (ii) How many of these are less than 400 ? (iii) How many are even ? (iv) How many are odd ? (v) How many are multiples of 5 ? Q.10 In how many ways can 5 letters be mailed if there are 3 mailboxes available if each letter can be mailed inanymailbox. Q.11 Every telephone number consists of 7 digits. How many telephone numbers are there which do not include any other digits but 2 , 3 , 5 & 7 ? Q.12(a) In how many ways can four passengers be accommodate in three railway carriages, if each carriage can accommodate any number of passengers. (b) In how many ways four persons can be accommodated in 3 different chairs if each person can occupy onlyonechair. Q.13 How many of the arrangements of the letter of the word “LOGARITHM” begin with a vowel and end with a consonant? Q.14 How many four digit numbers are there all whose digits are odd , if repetition of digits is allowed. Q.15 How many four digit numbers are there which are divisible by 2. Q.16 In a telephone system four different letter P, R, S, T and the four digits 3, 5, 7, 8 are used. Find the maximum number of “telephone numbers” the system can have if eachconsists of a letter followed by a four-digit number in which the digit may be repeated. Q.17 Find the number of 5 lettered palindromes which can be formed using the letters from the English alphabets. Q.18 Number of ways in which 7 different colours in a rainbow can be arranged if green is always in the middle. Q.19 Two cards are drawn one at a time & without replacement from a pack of 52 cards. Determine the number of ways in a definite order in which the two cards can be drawn in a definite order. Q.20 It is requiredto seat 5 menand4 women in a row so that thewomen occupy the even places. How many such arrangementsare possible? Q.21 Numbers of wordswhich can be formed using all the letters of the word "AKSHI", if each word begins with vowel or terminates in vowel. Q.22 A letter lock consists of three rings each marked with 10 different letters. Find the number of ways in which it is possible to make an unsuccessful attempts to open the lock. Q.23 How many 10 digit numbers can be made with odd digits so that no two consecutive digits are same. Q.24 If no two books are alike, in how many ways can 2 red, 3 green, and 4 blue books be arranged on a shelf so that all the books of the same colour are together? Q.25 How many natural numbers are there with the property that they can be expressed as the sum of the cubes of two natural numbers in two different ways.
3. Q.1 Thenumberofarrangements whichcan bemadeusingall thelettersof theword LAUGHifthevowels are adjacent is : (A) 10 (B) 24 (C) 48 (D) 120 Q.2 Thenumber ofnumbers from 1000 to 9999 (both inclusive) that do not haveall 4 different digits is : (A) 4048 (B) 4464 (C) 4518 (D) 4536 Q.3 The number of different seven digit numbers that can be written using only three digits 1, 2 & 3 under the conditionthat the digit 2 occurs exactlytwice in eachnumber is : (A) 672 (B) 640 (C) 512 (D) none Q.4 Out of seven consonants and four vowels, the number of words of six letters, formed by taking four consonants and two vowels is (Assume that each ordered group of letter is a word): (A) 210 (B) 462 (C) 151200 (D) 332640 Q.5 Allpossible threedigitsevennumberswhichcanbeformedwiththeconditionthatif5isoneofthedigit, then7is thenext digit is : (A) 5 (B) 325 (C) 345 (D) 365 Q.6 For some natural N, the number of positive integral 'x' satisfyingthe equation , 1 ! + 2 ! + 3 ! + ...... + (x !) = (N)2 is : (A) none (B) one (C) two (D) infinite Q.7 Thenumber ofsix digit numbers that can be formedfrom thedigits 1, 2,3, 4, 5, 6 & 7 so that digits do not repeat andthe terminal digits areeven is : (A) 144 (B) 72 (C) 288 (D) 720 Q.8 Howmanydifferentwords can be formed with fivedifferent lettersof which threeareconsonants and two are vowels , if notwo consonants being juxtaposed in anyword. Q.9 In how manycan 5 colour be selected out of 8 different colours including red, blue, and green (a) if blueand green are always to be included, (b) ifredis always excluded, (c) if red andblue are always included but green excluded? Q.10 A 5 digit number divisible by3 is to beformed usingthe numerals 0, 1, 2, 3, 4 & 5 without repetition . The total numberof ways this can bedone is : (A) 3125 (B) 600 (C) 240 (D) 216 Q.11 Numberof9digits numbersdivisiblebynineusingthedigitsfrom0to9ifeachdigitisusedatmostonce is K . 8!, then K has the value equal to ______ . Q.12 Numberofnaturalnumberslessthan1000anddivisibleby5canbeformedwiththetendigits,eachdigit not occuring morethan once in each number is ______ . CLASS : XI DPP. NO.– P & C - 2 MATHEMATICS Daily Practice Problems
4. Q.1 Threemenhave6different trousers, 5different shirts and4 differentcaps . Numberofdifferent ways in which theycanwear them is ______. Q.2 The number of 9 digit numbers that can be formed byusing the digits 1, 2, 3, 4 & 5 is : (A) 95 (B) 9! (C) 59 (D) 9P5 Q.3 The number of arrangements of the letters 'abcd' in which neither a, b nor c, d come together is: (A) 6 (B) 12 (C) 16 (D) none Q.4 Find the numberof ways in whichletters of the wordVALEDICTORYbe arranged so that the vowels maynever be separated. Q.5 Howmanynumbers between400and1000(bothexclusive)canbemadewith thedigits 2,3,4,5,6,0 if (a) repetitionofdigitsnot allowed. (b) repetitionofdigitsisallowed. Q.6 If 20Pr = 13× 20Pr–1 , then the value of r is ___________. Q.7 The numberof ways inwhich5different books canbe distributed among10people if eachperson can get at most one book is : (A) 252 (B) 105 (C) 510 (D) 10C5.5! Q.8 Marytyped a six-digit number, but the two 1's she typed didn't show.What appeared was 2006. Find thenumberofdifferent six-digit numbersshewould havetyped. Q.9 The9horizontal and 9 vertical lines on an 8 ×8 chessboard form'r'rectangles and 's'squares. The ratio r s in itslowest terms is (A) 6 1 (B) 108 17 (C) 27 4 (D) none Q.10 There are 720 permutations of the digits 1, 2, 3, 4, 5, 6. Suppose these permutations are arranged from smallest to largest numerical values, beginning from 1 2 3 4 5 6 and endingwith 6 5 4 3 2 1. (a) What numberfalls onthe 124th position? (b) What is the position of thenumber 321546? Q.11 Astudent hastoanswer10outof 13questions inanexamination. Thenumberofways in which hecan answer ifhemust answeratleast 3ofthefirst fivequestions is : (A) 276 (B) 267 (C) 80 (D) 1200 Q.12 The number ofthreedigitnumbers havingonly twoconsecutivedigits identical is : (A) 153 (B) 162 (C) 180 (D) 161 CLASS : XI DPP. NO.– P & C - 3 MATHEMATICS Daily Practice Problems
5. Q.1 Atelegraph hasxarms&eacharmiscapableof(x 1)distinctpositions,includingthepositionofrest. The total numberof signals that canbemade is ______. Q.2 Theinterioranglesofaregularpolygon measure150º each . Thenumberofdiagonals ofthepolygon is (A) 35 (B) 44 (C) 54 (D) 78 Q.3 Numberofdifferentnatural numberswhicharesmallerthantwohundredmillion& usingonlythedigits 1 or 2 is : (A) (3) . 28  2 (B) (3) . 28  1 (C) 2 (29  1) (D) none Q.4 5 Indian & 5American couples meet at a party& shake hands . If no wife shakes hands with her own husband&noIndian wifeshakeshands with amale,then thenumberofhand shakes that takesplacein the partyis : (A) 95 (B) 110 (C) 135 (D) 150 Q.5 Numberofndigitnumbers whichconsistsofthedigits 1 &2 onlyifeachdigit is tobeused atleast once, is: (A) 2n - 1  2 (B) 2n (C) 2n  1 (D) 2n  2 Q.6 Number ofsix digit numbers which have3 digits even &3 digits odd, ifeach digit is to be used atmost once is ______ . Q.7 The tamerof wild animals hastobringonebyone 5lions &4 tigers to thecircus arena. Thenumber of ways this can be done ifno two tigers immediatelyfollow each other is ______ . Q.8 The sides AB , BC & CA of a triangle ABC have 3 , 4 & 5 interior points respectively on them. The number of triangles that can be constructed using these interior points as vertices is _____. Q.9 An English school and a Vernacular school are both under one superintendent . Suppose that the superintendentship, the fourteachership of English andVernacular school each, are vacant, if there be altogether11 candidatesfor theappointments, 3ofwhom applyexclusivelyforthesuperintendentship and2 exclusivelyfor theappointment inthe English school, the number of ways inwhich the different appointments can bedisposed of is : (A) 4320 (B) 268 (C) 1080 (D) 25920 Q.10 A committee of 12 is to be formed from 9 women and 8 men . If each committee is to have atleast 5 womenthenthenumberofwaysofformingthecommitteeifthe men areinmajorityis : (A) 1008 (B) 1134 (C) 2702 (D) none Q.11 A question paper on mathematics consists of twelve questions divided into three parts A,BandC,eachcontainingfourquestions .In how manyways canan examineeanswerfive questions, selectingatleast onefrom each part . (A) 624 (B) 208 (C) 2304 (D) none Q.12 How many 5 digits numbers can be formed if (a) each successive digits exceeds its predecessor, (b)ifeachsuccessive digitissmallerthanits previousdigit. CLASS : XI DPP. NO.– P & C - 4 MATHEMATICS Daily Practice Problems
6. Q.1 There are m points on a straight lineAB & n points on the lineAC none of them being the pointA. Triangles areformed withthesepoints as vertices, when (i) Ais excluded (ii) Ais included .The ratio of numberof triangles in thetwo cases is: (A) m n m n    2 (B) m n m n     2 1 (C) 2 n m 2 n m     (D) m n m n ( ) ( ) ( )    1 1 1 Q.2 Number of ways in which 9 different prizes be given to 5 students if one particular boy receives 4 prizes and therest of the students can get anynumbers of prizes, is : (A) 9C4 . 210 (B) 9C5 . 54 (C) 4 . 45 (D) none Q.3 In acertainalgebraical exercise bookthereare 4 examplesonarithmetical progressions, 5examples on permutation combinationand6examples onbinomial theorem . Numberofways ateachercan select for his pupils atleast one but not more than 2 examples from each of these sets, is ______ . Q.4 The kindergartenteacherhas 25kids inherclass . Shetakes 5 ofthem at atime, tozoological garden as oftenas she can, without takingthesame5 kids more than once . Find the number ofvisits, the teacher makes to the garden and also thenumber of of visits everykid makes. Q.5 There are n persons and m monkeys (m > n). Number of ways in which each person maybecome the owner ofone monkeyis (A) nm (B) mn (C) mPn (D)mn Q.6 Sevendifferentcoinsareto bedividedamongstthreepersons.Ifno twoofthepersonsreceivethesame numberofcoinsbuteachreceivesatleastonecoin &noneis leftover,thenthenumberofwaysinwhich thedivisionmaybemadeis : (A) 420 (B) 630 (C) 710 (D) none Q.7 Let there be9 fixed points onthe circumference of acircle . Each ofthese points is joined to everyone of the remaining8 points bya straight line and the points are so positioned on the circumference that atmost 2straight lines meet in anyinterior point ofthe circle. The numberofsuch interior intersection pointsis: (A) 126 (B) 351 (C) 756 (D) none of these Q.8 Thenumberof5digit numberssuchthat thesumoftheirdigits iseven is : (A) 50000 (B) 45000 (C) 60000 (D) none Q.9 Aforecastis tobemadeoftheresultsoffivecricketmatches,eachofwhich canbewin, adrawora loss forIndianteam.Find (i) thenumberofdifferent possibleforecasts (ii) the number of forecasts containing 0, 1, 2, 3, 4 and 5 errors respectively Q.10 The numberofways in which 8 non-identical apples can be distributed among 3 boys such that every boyshould get atleast 1 apple & atmost 4 apples is K · 7P3 where K has the value equal to : (A) 88 (B) 66 (C) 44 (D) 22 Q.11 Awomenhas11closefriends.Findthenumberofwaysinwhichshecaninvite5ofthemtodinner,iftwo particular ofthem are not onspeaking terms & will not attend together. Q.12 A rack has 5 different pairs ofshoes . The number of ways in which 4 shoes can be chosen from it so that therewill be no complete pair is : (A) 1920 (B) 200 (C) 110 (D) 80 CLASS : XI DPP. NO.– P & C - 5 MATHEMATICS Daily Practice Problems
7. Q.1 Number of different ways in which 8 different books can be distributed among 3 students, if each student receives atleast 2 books is ______. Q.2 There are sixteen Indian soldiers in Pakistani Jail as prisoners of war (POW); Indian has eighteen Pakistani soldiers as POW in its jail. As per the agreement between the leaders of the two nations, it is decided to exchange three of the POWs every month. the number of ways in which the first exchange of POWs takes place is (A) 1376 (B) 456960 (C) 459660 (D) 537 Q.3 There are 10 seats in a double decker bus, 6 in the lower deck and 4 on the upper deck. Ten passengers board the bus, of them 3 refuse to go to the upper deck and 2 insist on going up. The number of ways in which the passengers can be accommodated is _____. (Assume all seats to be duly numbered) Q.4 Find the number of permutations of the word "AUROBIND" in which vowels appear in analphabetical order. Q.5 The greatest possible number of points of intersection of 9 different straight lines & 9 different circles in a plane is: (A) 117 (B) 153 (C) 270 (D) none Q.6 An old man while dialing a 7 digit telephone number remembers that the first four digits consists of one 1's, one 2's and two 3's. He also remembers that the fifth digit is either a 4 or 5 while has no memorising of the sixth digit, he remembers that the seventh digit is 9 minus the sixth digit. Maximum number of distinct trials he has to try to make sure that he dials the correct telephone number, is (A) 360 (B) 240 (C) 216 (D) none Q.7 If as many more words as possible be formed out of the letters of the word "DOGMATIC" then the number of words in which the relative order of vowels and consonants remain unchanged is ______ . Q.8 Number of ways in which 7 people can occupy six seats, 3 seats on each side in a first class railway compartment if two specified persons are to be always included and occupy adjacent seats on the same side, is (5 !) · k then k has the value equal to : (A) 2 (B) 4 (C) 8 (D) none Q.9 Number of ways in which 9 different toys be distributed among 4 children belonging to different age groups in such a way that distribution among the 3 elder children is even and the youngest one is to receive one toy more, is (A) 8 ) ! 5 ( 2 (B) 2 ! 9 (C) 3 ) ! 2 ( ! 3 ! 9 (D) none Q.10 In an election three districts are to be canvassed by 2, 3 & 5 men respectively . If 10 men volunteer, the number of ways they can be alloted to the different districts is : (A) 10 2 3 5 ! ! ! ! (B) 10 2 5 ! ! ! (C) 10 2 5 2 ! ( !) ! (D) 10 2 3 5 2 ! ( !) ! ! Q.11 Let Pn denotes the number of ways in which three people can be selected out of ' n ' people sitting in a row , if no two of them are consecutive. If , Pn + 1  Pn = 15 then the value of ' n ' is : (A) 7 (B) 8 (C) 9 (D) 10 Q.12 A cricket team consisting of eleven players is to be selected from two sets consisting of six and eight players respectively. In how many ways can the selection be made, on the supposition that the set set of six shall contribute not fewer than four players. Q.13 An organisation has 25 members, 4 of whom are doctors. In how many ways can a committee of 3 members be selected so as to included at least 1 doctor. Q.14 A has 3 maps and B has 9 maps. Determine the number of ways in which they can exchange their maps if each keeps his initial number of maps. Q.15 Number of three digit number with atleast one 3 and at least one 2 is (A) 58 (B) 56 (C) 54 (D) 52 CLASS : XI DPP. NO.– P & C - 6 MATHEMATICS Daily Practice Problems
8. Q.1 Total number of ways in which 6 ‘+’ & 4 ‘’ signs can be arranged in a line such that no 2 ‘’ signs occur together is _______. Q.2 There are 10 red balls of different shades & 9 green balls of identical shades . Then the number of arrangingthem in a row so that no two green balls aretogether is : (A) (10 !) . 11P9 (B) (10 !) . 11C9 (C) 10 ! (D) 10 ! 9 ! Q.3 Numberofways inwhich n distinct objectscanbe keptintotwoidenticalboxesso thatno box remains empty, is ______ . Q.4 Ashelfcontains20different books ofwhich4 areinsinglevolumeand theothersform sets of8, 5 and 3 volumes respectively. Number of ways in which the books may be arranged on the shelf, if the volumes of each set are together and in their due order is (A) ! 3 ! 5 ! 8 ! 20 (B) 7! (C) 8! (D) 7 . 8! Q.5 If all the letters of the word "QUEUE" are arranged in all possible manner as they are in a dictionary , then the rank of the word QUEUE is : (A) 15th (B) 16th (C) 17th (D) 18th Q.6 Thereare12differentmarblestobedividedbetweentwo childrenintheratio1:2.Thenumberofways it can be done is : (A) 990 (B) 495 (C) 600 (D) none Q.7 All the five digits number in which each successive digit exceeds its predecessor are arranged in the increasingorder oftheirmagnitude. The 97th numberinthelist does notcontain thedigit (A) 4 (B) 5 (C) 7 (D) 8 Q.8 Thenumberofcombinationof16things,8ofwhicharealikeandtherestdifferent,taken8atatimeis _____. Q.9 Thenumberofdifferentwaysinwhichfive'dashes'andeight'dots'can bearranged, usingonlysevenof these 13 'dashes' & 'dots' is : (A) 1287 (B) 119 (C) 120 (D) 1235520 Q.10 In a certain college at the B.Sc. examination, 3 candidates obtained first class honours in each of the followingsubjects: Physics, Chemistryand Maths, no candidates obtaining honours inmore thanone subject;Numberofwaysinwhich9scholarshipsofdifferentvaluebeawardedtothe9candidatesifdue regard is to be paid onlyto the places obtained bycandidates in anyone subject is __________. Q.11 There are nidentical red balls &m identical green balls . The number ofdifferent linear arrangements consistingof"nredballs but not necessarilyall thegreen balls"isxCy then (A) x = m + n , y = m (B) x = m + n + 1 , y = m (C) x = m + n + 1 , y = m + 1 (D) x = m + n , y = n Q.12 The number of different ways in which the letters of the word IITJEE can beplaced in the 8 boxes in the given figure so that no row remains empty is _____ . Q.13 How many ways can 9different prizes be awarded totwo students so thatone receives 3 andthe other 6. Q.14 How many different arrangements are possible with the factor of the term a2b4c5 written at full length. Q.15 Findthenumberof 4digit numbers startingwith1 andhavingexactlytwoidentical digits. CLASS : XI DPP. NO.– P & C - 7 MATHEMATICS Daily Practice Problems
9. Q.1 Number of different words that can be formed using all the letters of the word "DEEPMALA" if two vowels are together and the other two are also together but separated from the first two is : (A) 960 (B) 1200 (C) 2160 (D) 1440 Q.2 Thenumberofwaysin which10boyscan takepositions about aroundtableiftwo particularboys must not be seated side byside is : (A) 10 (9)! (B) 9 (8)! (C) 7 (8) ! (D) none Q.3 In aunique hockeyseries betweenIndia & Pakistan,theydecide to playontill a team wins 5 matches . The number of ways in which theseries can be won byIndia, if no match ends in a draw is : (A) 126 (B) 252 (C) 225 (D) none Q.4 Number of ways in which n things of which r alike & the rest different can be arranged in a circle distinguishingbetweenclockwiseandanticlockwisearrangement,is: (A) ( ) ! ! n r r   1 (B) ( ) ! n r  1 (C) ( ) ! ( ) ! n r   1 1 (D) ( ) ! ! n r  1 Q.5 Thenumberofwaysofarranging2mwhite&2nredcountersinstraightlinesothat eacharrangementis symmetrical with respect to a central markis ______ . (assume that all counters are alike except for the colour) Q.6 A gentleman invites a party of m + n (m  n) friends to a dinner & places m at one table T1 and n at another table T2 , the table being round . If not all people shall have the same neighbour in any two arrangement, then thenumber of ways in whichhe can arrange theguests, is (A) ( ) ! m n mn  4 (B) 1 2 ( ) ! m n mn  (C) 2 ( ) ! m n mn  (D) none Q.7 Delegates from 9 countries includes countriesA, B, C, D are to be seated in a row . The number of possibleseatingarrangements,when thedelegates ofthecountriesAand Bareto beseatednext to each other and the delegates of the countries C and D are not to be seated next to each other is : (A) 10080 (B) 5040 (C) 3360 (D) 60480 Q.8 There are 12 guests at a dinner party. Supposingthat the master and mistress of the house have fixed seats opposite oneanother, and that thereare two specified guests who must always, beplaced next to one another; the number ofways in which the companycan be placed, is: (A) 20 . 10 ! (B) 22 . 10 ! (C) 44 . 10 ! (D) none Q.9 Let Pn denotes thenumber of ways of selecting3 peopleout of 'n' sitting in a row, ifno two of them are consecutive and Qn is the corresponding figure when theyare in a circle . If Pn  Qn = 6 , then 'n' is equal to : (A) 8 (B) 9 (C) 10 (D) 12 CLASS : XI DPP. NO.– P & C - 8 MATHEMATICS Daily Practice Problems
10. Q.10 Define a 'goodword'as a sequenceof letters that consists onlyof the lettersA,B and C andin whichA never immidiatelyfollowed byB, B is never immediatelyfollowed byC, and C is never immediately followed byA.If the number of n-letter good words are 384, find the value of n. Q.11 Six marriedcoupleare sittingina room. Findthenumber of ways in which 4 peoplecan be selected so that (a) theydo not form a couple (b) theyformexactlyonecouple (c) theyform at least one couple (d) theyformatmost one couple Q.12 Find the numberof different permutations ofthe letters of the word “ BOMBAY” taken fourat a time. Howwouldtheresultbeaffectifthenameischangedto“MUMBAI”.Alsofindthenumberofcombinations of the letters taken 3 at a time in both the cases. Q.13 Fiftycollegeteachersare surveyedas totheirpossession ofcolourTV,VCR and taperecorder.Ofthem , 22 own colour TV, 15 own VCR and 14 own tape recorders. Nine of these college teachers own exactlytwo items out of colourTV,VCR and tape recorders ; and, one college teacher owns all three. how manyof the 50 college teachers own none of three, colourTV,VCR or tape recorder? (A) 4 (B) 9 (C) 10 (D) 11 Q.14 Aroadnetworkasshowninthefigureconnect fourcities.Inhowmany ways can you start from anycity(sayA) and come back to it without travellingonthe same road more than once ? (A) 8 (B) 12 (C) 9 (D) 16 Q.15 There are (p + q) different books on different topics in Mathematics. (p  q) If L = The number of ways in which these books are distributed between two studentsX and Y such that X get p books and Y gets q books. M = Thenumber of ways in which these books are distributed between two students X and Y such that one of them gets p books and another gets q books. N = The number of ways in which these books are divided into two groups of p books and q books then, (A) L = M = N (B) L = 2M = 2N (C) 2L = M = 2N (D) L = M = 2N
11. Q.1 On a Railway route from Kota to Bina there are 12 stations.A booking clerk is to be deputed for each of these stations out of 12 candidates of whom five are Marathis, four are Oriyas and the rest are Begalis. The number of ways of deputing the persons on these stations so that no two Bengali’s serve on two consecutive stations, is _____________.(Persons of the same religieon are not to be distinguished) Q.2 Let m denote the number of ways in which 4 different books are distributed among 10 persons, each receiving none or one only and let n denote the number of ways of distribution if the books are all alike. Then : (A) m = 4n (B) n = 4m (C) m = 24n (D) none Q.3 The number of ways in which we can arrange n ladies & n gentlemen at a round table so that 2 ladies or 2 gentlemen may not sit next to one another is : (A) (n  1) ! (n  2) ! (B) (n !) (n  1) ! (C) (n + 1) ! (n) ! (D) none Q.4 The number of ways in which 10 identical apples can be distributed among 6 children so that each child receives atleast one apple is : (A) 126 (B) 252 (C) 378 (D) none of these Q.5 The number of divisors of apbqcrds where a, b, c, d are primes & p, q, r, s  N, excluding 1 and the number itself is : (A) pqrs (B) (p + 1) (q + 1) (r + 1) (s + 1)  4 (C) pqrs  2 (D) (p + 1) (q + 1) (r + 1) (s + 1)  2 Q.6 The number of all possible selections of one or more questions from 10 given questions, each equestion having an alternative is : (A) 310 (B) 210  1 (C) 310  1 (D) 210 Q.7 The number of ways in which 14 men be partitioned into 6 committees where two of the committees contain 3 men & the others contain 2 men each is : (A) 14 3 2 2 4 ! ( !) ( !) (B) 14 3 2 2 5 ! ( !) ( !) (C) 14 4 3 2 2 4 ! ! ( !) . ( !) (D) 14 2 3 4 5 2 ! ( !) . ( !) . ! Q.8 The number of divisors of the number 21600 is _____ and the sum of these divisors is ______. Q.9 10 IIT & 2 PET students sit in a row. The number of ways in which exactly 3 IIT students sit between 2 PET student is ______. Q.10 The number of ways of choosing a committee of 2 women & 3 men from 5 women & 6 men, if Mr. A refuses to serve on the committee if Mr. B is a member & Mr. B can only serve, if Miss C is the member of the committee, is : (A) 60 (B) 84 (C) 124 (D) none Q.11 Six persons A, B, C, D, E and F are to be seated at a circular table . The number of ways this can be done if A must have either B or C on his right and B must have either C or D on his right is : (A) 36 (B) 12 (C) 24 (D) 18 Q.12 There are 2identical white balls, 3identical redballs and 4 greenballs of different shades. The number of ways in which they can be arranged in a row so that atleast one ball is separated from the balls of the same colour, is (A) 6 (7 !  4 !) (B) 7 (6 !  4 !)(C) 8 !  5 ! (D) none Q.13 Sameer has to make a telephone call to his friend Harish, Unfortunately he does not remember the 7 digit phone number. But he remembers that the first three digits are 635 or 674, the number is odd and there is exactly one 9 in the number. The maximum number of trials that Sameer has to make to be successful is (A) 10,000 (B) 3402 (C) 3200 (D) 5000 Q.14 Out of (2n + 1) students, n students have to be given the scholarships. The number of ways in which at least one student can be given the scholarship is, 63. What is the number of students receiving the scholarship? (A) 5 (B) 7 (C) 3 (D) 9 Q.15 Boxes numbered 1, 2, 3, 4 and 5 are kept in a row, and they necessarily to be filled with either a red or a blue ball, such that notwo adjacent boxes canbe filled withblue balls. Then howmany different arrangements are possible, given that the balls of a given colour are exactly identical in all respects? (A) 8 (B) 10 (C) 13 (D) 22 CLASS : XI DPP. NO.– P & C - 9 MATHEMATICS Daily Practice Problems