Q31. Which of the following is the correct formula for permutations, denoted as nPr, which calculates the number of ways to arrange r items from a set of n distinct items?Mathematics — NUST Mock 2 — Question 31 of 200A. n! / (r!(n-r)!)B. n! / (n-r)!C. nrD. n!(n-r)!Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →