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If ^nP3 = 4*^nP2. Find n.(a) 3(b) 2(c) 6(d) 5The question was posed to me by my college director while I was bunking the class.I want to ask this question from Permutations-2 topic in section Permutations and Combinations of Mathematics – Class 11

Answer»

Right option is (c) 6

Explanation: ^nP3 = 4*^nP2

\(\FRAC{n!}{(n-3)!} = 4 * \frac{n!}{(n-2)!}\)

=> n-2 = 4

=> n=6.



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