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Riddle Of The Crusaders

Answer :

The correct answer is that there would have been 602,176 Crusaders, who could form themselves into a square 776 by 776; and after the stranger joined their ranks, they could form 113 squares of 5,329 men—that is, 73 by 73. Or 113 × 732 - 1 = 7762.

Medieval Brain Teasers