Find the value of n. nP2 = 132. *
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Answer:
nP2 = 72
n!/(n-2)! = 72
n*(n-1)*(n-2)! / (n-2)! = 72
n*(n-1) = 72
n^2 - n - 72 = 0
n^2 - 9n + 8n - 72= 0
(n-9) = 0, (n+8) = 0
=> n = 9, -8
We take (+) value.
Ans = 9.
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