Question

^nPr = ________________

(a) n!

(b) \(\frac{n!}{r!}\)

(c) \(\frac{n!}{(n-r)!}\)

(d) \(\frac{n!}{(n-r)! r!}\)

The question was posed to me by my college director while I was bunking the class.

I would like to ask this question from Permutations-1 topic in chapter Permutations and Combinations of Mathematics – Class 11

Answer 1

Correct answer is (c) \(\frac{n!}{(n-r)!}\)

The best I can explain: Permutation is known as arrangement. ^nPr means arranging r objects out of n.

^nPr = \(\frac{n!}{(n-r)!}\).