Shown above are 4 men buried up to
their necks in the ground.
They can not move so can only look
Between A and B is a brick wall which
can not be seen through.
They know that between them are 4
hats, 2 x black and 2 x white, but they do not know which colour they are
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 1 minute:
Q. One of them calls out the
correct answer. Which one calls out?
Q. Why is he 100% certain of
the colour of his hat ?
This is not a trick question.
There are no outside influences 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 brick wall,
C can see B and D can see B & C.
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