1 * 1 = 1 * 2 = 2 2 * 2 =4 * 2 = 8 3 * 3 = 9 * 2 = 18 4 * 4 = 16 * 2 = 32 5 * 5 = 25 * 2 = 50 6 * 6 = 36 * 2 = 72 7 * 7 = 49 * 2 = 98 8 * 8 = 64 * 2 = 128 9 * 9 = 81 * 2 = 162.
Answer is 72
Which number replaces the question mark - 12, 9, 7, 3, 4, 6, ??