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Thread: Combinations

  1. May 20th 2009, 03:29 PM #1
    patrickyou
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    Combinations

    How do I solve for x?

    C(x, 7) = C(x, 2)

    Thanks!
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  2. May 20th 2009, 03:36 PM #2
    Plato
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    \left\{ \begin{gathered}<br /> \binom{x}{7} = \binom{x}{2} \hfill \\<br /> \binom{n}{k} = \binom{n}{n-k} \hfill \\ <br /> \end{gathered} \right.\, \Rightarrow \,2 = x - 7
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  3. May 20th 2009, 03:41 PM #3
    patrickyou
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    Do you mind walking me through it step by step? Thanks.
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  4. May 20th 2009, 04:03 PM #4
    Plato
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    Quote Originally Posted by patrickyou View Post
    Do you mind walking me through it step by step? Thanks.
    Yes I do mind.
    You think about it.
    If you really understand combinations then it is simple.
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