The document defines probability as the ratio of favorable cases to total possible cases according to the American Heritage Dictionary. It provides examples of calculating probability by dividing the number of favorable outcomes by the total number of possible outcomes in mutually exclusive events. The document explains the basic definition and calculation of probability.

3. According To American Heritage Dictionary(AHD) –
p =No of cases favorable to the occurrence of the event
total no of mutually exclusive and exhaustive cases

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