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Math Help - permutation

  1. #1
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    jpn
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    permutation

    why is nPk "n!/(n-k)!" ?
    i'm understanding that nPk = n*(n - 1)***(n - k + 1).
    uhh...

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  2. #2
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    Re: permutation

    Quote Originally Posted by miki View Post
    why is nPk "n!/(n-k)!" ?
    i'm understanding that nPk = n*(n - 1)***(n - k + 1).
    uhh...


    N!=N\cdot(n-1)\cdots(N-k+1)(N-k)!

    Example _{10}P_4=10\cdot 9\cdot 8\cdot 7=\frac{10!}{(10-4)!}
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  3. #3
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    Re: permutation

    thanks a lot !
    i understod your reply meaning.
    i try it!
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