Hint to Riddle #12: Three Men and Red & Blue Hats
It's difficult to give too many clues without walking you through the answer.
Person A, the first man, does not know what colour hat he's wearing, this is not an insignificant piece of information. You have to think under what circumstances would he know what colour hat he had on. Since he doesn't know, we know that not to be the case.
Having eliminated a certain scenario we have only certain other scenarios left, we continue the deductive process until only one scenario is left.
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