82. eg. 1 - 20 1 - 9 10 - 20 Note: 1. Test for digit 1, If passed, Then no need to test for digits 2 – 9 2. Test for digit 10, If passed, Then no need to test for digits 11 - 20
131. It is nearly impossible to look into every bit of code to find out hidden errors, Which may create problem, resulting in failure of the application.