A team of 18 softball players needs to

choose three players to refill the water cooler.

A class of 30 students wants to

elect a president, vice president, secretary, and treasurer.

There are 100 people at a meeting. They each shake

hands with everyone else. How many handshakes were there?

A group of 15 people are going to run a race. The top 8 finishers advance to the finals.

A group of 45 people are going to run a race. The top three runners earn gold, silver, and bronze medals.