Three logicians, A, B, and C, are wearing hats, which they know are either black or white but not all white. A can see the hats of B and C; B can see the hats of A and C; C is blind. Each is asked in turn if they know the color

of their own hat. The answers are

A: "No." B: "No." C: "Yes."

What color is C's hat and how does she know?

Black Hat Solution

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