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2 February, 16:03

What is the value of 7P5?

A. 5040

B. 2520

C. 42

D. 21

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Answers (1)
  1. 2 February, 16:28
    0
    The answer is B. 2520

    For permutation P we will use:

    nPr = n! / (n-r) !

    7P5 = ?

    n = 7

    r = 5

    7P5 = 7! / (7-5) !

    = (7 * 6 * 5 * 4 * 3 * 2 * 1) / 2!

    = 5040 / (1 * 2)

    = 5040/2

    = 2520
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