The numbers 1 to 72 add up to (1+72) x 72/2 = 73 x 36 = 2628 If we take away what Josh got we have 2628 - 2521 = 107 Pages in a book are odd on the first side and even on the second, so pages 11 and 12 are on the same sheet. 107 / 2 = 53.5 so the missing page had 53 on one side and 54 on the other side. The remaining pages would have been numbered 1, 2, 3, ..., 51, 52, 55, 56, ... 71, 72
