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Thread: Binominal help

  1. September 18th 2009, 02:00 AM #1
    helloying
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    Binominal help

    n
    c2 = 28

    how do i find what is n?
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  2. September 18th 2009, 02:04 AM #2
    red_dog
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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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