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Math Help - proof

  1. #1
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    proof

    How to prove that:

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  2. #2
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    Re: proof

    Quote Originally Posted by Mhmh96 View Post
    How to prove that:
    Note that \sum\limits_{k = 1}^5 {k!}  = 153 is a multiple of nine.

    Also, if N\ge 6 then 6!={\color{blue}6}\cdot 5\cdot 4\cdot{\color{blue}3}\cdot 2={\color{blue}720} which is a multiple of nine.

    If N\ge 6 then N! is a multiple of nine. WHY?
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