nP3 = 9240 ⇒ n! / (n-3)! = 9240 ⇒ n(n - 1)(n - 2) = 9240⇒ n(n - 1)(n - 2) = 22 x 21 x 20 ∴ n = 22
Previous Question Next Question
Your comments will be displayed only after manual approval.
