Can you solve it? A head for hats
by Alex Bellos from Science | The Guardian on (#5CNDF)
A Q about a queue
Today's puzzle concerns these three folk standing in a line, as illustrated below. They are all extremely logical people, and they can only see who is in front of them.
A hat seller shows them three white and two black hats. She places a hat on each person and hides the remaining two.
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