Question: Refer to Exercise. In how many ways can five TV commentators be seated at a round table for a discussion?
Exercise: CIRCULAR PERMUTATIONS Suppose n distinct objects are arranged in a circle. Show that the number of (different) circular arrangements of the n objects is (n 1)!. Hint: Consider the arrangement of the five letters A, B, C, D, and E in the accompanying figure. The permutations ABCDE, BCDEA, CDEAB, DEABC, and EABCD are not distinguishable. Generalize this observation to the case of n objects.
