Man A is on the left looking to the right at a brick wall with a black cap on. Man B, C, and D are looking to the left. B has a white cap, C, a black one and D a white one. Between A and B is a brick wall which can not be seen through. They know that between them are 4 hats, 2 are black and 2 are white. They do not know what colour they are wearing. In order to avoid being shot one of them must call out to the executioner the colour 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:
Q. Which one of them calls out?
Q. Why is he 100% certain of the colour of his hat?
This is not a trick question. There are no outside influence nor other ways of communicating. They cannot move and are buried in a straight line. So A & B can only see their respective sides of the wall, C can see B and D can see B & C.
2007-08-17
08:59:48
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6 answers
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Jo
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