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Math Help - Binominal help

  1. #1
    Member helloying's Avatar
    Joined
    Jul 2008
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    177

    Binominal help

    n
    c2 = 28

    how do i find what is n?
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  2. #2
    MHF Contributor red_dog's Avatar
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    C_n^2=\frac{n(n-1)}{2}

    Then \frac{n(n-1)}{2}=28\Rightarrow n^2-n-56=0

    Now solve the quadratic and choose the positive integer solution.
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