Math

If n!/2=(n-2)! then n=?

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  1. n(n-1)(n-2)!/2 = (n-2)!
    n(n-1)/2 = 1
    n(n-1) = 2
    n^2 - n - 2 = 0
    (n-2)(n+1) = 0
    n = 2

    check: 2!/2 = 0!
    2/2 = 1

    Seems they could have come up with a better problem for using this concept.

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