1. The drama club is staging a play. With 6 men and 8 women auditioning for the leading male and female roles, how many ways can the director cast his leading couple?
2. How many ways are there to pick a King or a Queen from a standard pack of 52 poker cards?
3. A team of 3 students is to be formed from a class of 25 students. How many ways are there to form this team if there is 1 team leader, 1 scribe and 1 timekeeper in the team and each person can only perform one role at a time?
4. How many ways are there to form a three-letter word from “Tuesday”?
P.S. When am I suppose to apply permutation formula? when should I apply combination? i know permutation - order matter combination - order doesn't. but somehow i cant differentiate which to apply when question such as No.3 and 4 come out? can anyone teach me? thanks