20 May '07 16:41>
There are 5 hats on a table. 3 white hats, 2 red ones. Facing away from the table are three chairs, all in a straight line. 3 men sit down, one in each chair. A fourth man walks by the table and randomly chooses 3 hats and places one on each sitting man's head. He tells each man to sit still and face forward so that they can only see the chair(s) in front of them. He asks the man closest to the table "Do you know what color hat you are wearing?" He says "No." He asks the middle man the same question and gets the same answer. When he gets to the last man(who cannot see anyone, as nobody is sitting in front of him), the last man answers "Yes." What color is the last man's hat, and how does he know?