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Math Help - Combinations

  1. #1
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    Combinations

    How do I solve for x?

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

    Thanks!
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  2. #2
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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. #3
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    Do you mind walking me through it step by step? Thanks.
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  4. #4
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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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