3 years ago

What is the value of 7P5? A.5040 B.2520 C.42 D.21

1 answer:

5 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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