6.How many 9-member committees can be formed from a class consisting of 27 students?What if three particular students must be included on the committee?

7.In a game of musical chairs, 12 children will sit in 11 chairs arranged in a row.One child will be left out.In how many ways can the 12 children find seats?

8.A mailman has special delivery mail for 16 customers.

(a)In how many ways can he arrange his schedule to deliver to all 16?

(b)In how many ways can he schedule deliveries if he can deliver to only 9 of the 16?

9.Six orchids are to be selected from a collection of 11 for a flower show.

(a)In how many ways can this be done?

(b)In how many different ways can the group of 11 be selected if 3 particular orchids must be included?