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11 February, 08:37

A - If P (n, 4) = 20 * P (n, 2), determine the value of n.

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  1. 11 February, 09:41
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    P (n, 4) : P (n, 2)

    = (n-2) (n-3)

    20 = 4 * 5 (two consecutive numbers)

    (n-2) (n-3) = 5*4

    n-2=5

    n=7
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