91Ó°ÊÓ

Find \({ }_{9} \mathrm{C}_{4}\)

How many different five-card hands can be obtained from a Fifty -two card deck?

In how many ways can we select a committee of 3 from a group of 10 people?

How many baseball teams of nine members can be chosen from among twelve boys, without regard to the position played by each member?

From 12 books in how many ways can a selection of 5 be made, when one specified book is always included, (2) when one specified book is always excluded?

A boy has in his pocket a penny, a nickel, a dime, and a quarter. How many different sums of money can he take out if he removes one or more coins?