Stage 32 · Counting, Permutations, Combinations & the Binomial Theorem

32.2.2 The Permutation Formula A(n,m)

32.2 Permutations: When Order Counts Too

Point 2 of 6

32.2.2 The Permutation Formula A(n,m)

Core idea

To line up m people chosen from n, the first spot has n choices, the second n-1, and so on; multiply them together and you get the permutation count A(n,m)

Module goal. Understand counting where the selection is ordered, master the permutation formula and factorials, and learn to spot permutation problems that carry restrictions

eastmath.com · 32.2 Permutations: When Order Counts Too · 32.2.2 The Permutation Formula A(n,m)