Calculating PermutationsCalculating Permutations and Job Interview Questions The permutation of a set is the number of ways that the items in the set can be uniquely ordered. For example, the permutations of the set { 1, 2, 3} are { 1, 2, 3}, { 1, 3, 2}, { 2, 1, 3}, { 2, 3, 1}, { 3, 1, 2} and { 3, 2, 1}. For N objects, the number of permutations is N! (N factorial, or 1 * 2 * 3 * ... N). Aside from theoretical interest i
