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Math Help - Permutations and Combinations

  1. #1
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    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.
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  2. #2
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    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.
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  3. #3
    Senior Member Shanks's Avatar
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    Perhaps, you are one of those 8 guys who slip out the back door during the combinatics class.
    Joke!
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  4. #4
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