Watch “Solving Permutations 1” and “Solving Permutations 2” about how to solve nP2 = 6 and 8Pr = 56. Notice that in “Solving Permutations 2” the variable is in the denominator. Remember that when there is a variable in the denominator, non-permissible values are introduced.
You will now practise solving permutation equations where either n or r are not known.
Complete questions 7.a., 7.d., 22, and 23 from “Check Your Understanding” on pages 525 and 526 of the textbook. Answer