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Mind Reader
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Welcome the Firing Squad!
The graphic above depicts four men, buried up to their necks, about to get shot by a firing squad (ah, the poor souls). 'A' is facing the wall from the left, the other 3 (B, C, D) are facing the wall from the right. They know they are 3 on one side and 1 on the other. They are also lined up in a straight line and cannot see around or through the wall. They had their hats put on at night and so they do not know what color of hat they are wearing; but they know there are four men altogether and that two of them are wearing a white hat and two a black one. In order to for all of them to avoid being shot, one of them must call out to the executioner the color of THEIR hat. If they get it wrong, they will all be shot. They are not allowed to talk to each other, nor is there any other form of communiciation. They have 5 minutes to figure it out. After two minutes of silence: Why is he certain of the color of his hat? This is not a trick question. They cannot move. They are buried in a straight line. A & B can only see their respective views of the wall, C can see B, and D can see B & C. Give Up? If you can't figure it out wave your mouse over the bottom of this page (within the black part) until you see the hidden link and then click on it for the solution.
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