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Math Help - Permutations and Combinations

  1. #1
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    Permutations and Combinations

    I have this question:
    How many subsets with 7 elements does a set with 9 elements have?
    Can someone show me how to solve this or a similar problem?
    Last edited by malfist; January 26th 2009 at 08:00 PM.
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  2. #2
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    Quote Originally Posted by malfist View Post
    Can someone show me how to solve this or a similar problem?
    This is a simple combination: {9 \choose 7} = \frac{9!}{(7!)(2!)}
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