In his book The Lady or the Tiger and Other Logic Puzzles, Raymond Smullyan proposes the following problem. It is taken from the classic Frank Stockton short story, in which a prisoner must make a choice between two doors: behind one is a beautiful lady, and behind the other is a hungry tiger.
What if each door has a sign, and the man knows that only one sign is true?
The sign on Door 1 reads:
IN THIS ROOM THERE IS A LADY AND IN THE OTHER ROOM THERE IS A TIGER.
The sign on Door 2 reads:
IN ONE OF THESE ROOMS THERE IS A LADY AND IN ONE OF THESE ROOMS THERE IS A TIGER.
With this information, the man is able to choose the correct door. Can you?
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