There are 6 periods in each working day of a school. In how many ways can one organize 5 subjects such that each subject is allowed at least one period?
Correct Answer : D
In how many different ways can 5 girls and 5 boys form a circle such that the boys and the girls alternate?
How many 6 digit telephone numbers can be formed if each number starts with 35 and no digit appears more than once?
A question paper has two parts P and Q, each containing 10 questions. If a student needs to choose 8 from part P and 4 from part Q, in how many ways can he do that?