Problem: Inside of a dark closet are five hats: three blue and two red. Knowing this, three smart men go into the closet, and each selects a hat in the dark and places it unseen upon his head. Once outside the closet, no man can see his own hat.
The first man looks at the other two, thinks, and says, “I cannot tell what colour my hat is.”
The second man hears this, looks at the other two, and says, “I cannot tell what colour my hat is either.”
The third man is blind. The blind man says, “Well, I know what colour my hat is.”
What colour is his hat?
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blue
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