Permutation or Combination

Rob and Mary are planning trips to nine

countries this year. There are 13 countries

they would like to visit. They are deciding

which countries to skip.

The batting order for seven players on a 12

person team.

A team of 8 basketball players needs to

choose a captain and co-captain.

There are 45 applicants for three Computer

Programmer positions.

Castel and Joe are planning trips to three

countries this year. There are 7 countries

they would like to visit. One trip will be

one week long, another two days, and the

other two weeks.

You are setting the combination on a

three-digit lock. You want to use the

numbers 123 but don't care what order they

are in.

A group of 25 people are going to run a

race. The top 8 finishers advance to the

finals.

There are 110 people at a meeting. They

each shake hands with everyone else. How

many handshakes were there?

A team of 17 softball players needs to

choose three players to refill the water

cooler.

5 out of 13 students will ride in a car

instead of a van