Brainteaser – Four Men in Hats

Four Men in Hats


Shown  above are four men buried up to their necks in the ground. They cannot  move, so they can only look forward. Between A and B is a brick wall  which cannot be seen through.

They all know that between them  they are wearing four hats–two black and two white–but they do not  know what color they are wearing. Each of them know where the other  three men are buried.

In order to avoid being shot, one of them  must call out to the executioner the color of their hat. If they get it  wrong, everyone will be shot. They are not allowed to talk to each other  and have 10 minutes to fathom it out.

After one minute, one of them calls out.

Question: Which one of them calls out? Why is he 100% certain of the color of his hat?


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Source: Quora



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