Thread: Permutations and Combinations

There are 30 people in a class learning about permutations. One after another, 8 people gradually slip out the back door. In how many ways can this exodus occur?

Would I use this to solve the problem?
P(30,8)=30!/22!

Thanks for any help.

Would I use this to solve the problem?
P(30,8)=30!/22!

I think so. You need to find the number of ways to select 8 people out of 30 where the order matters.

Perhaps, you are one of those 8 guys who slip out the back door during the combinatics class.
Joke!