What is the answer to this riddle? Two guards, one always tells the truth, the other always lies. 2 doors, one to freedom, one to death. What question would you ask a guard to find the freedom door?


Ask the one who always tells the truth which door is heaven.

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Door Riddle

The Truth may refer to:

It is also used as a title for creative works and a nickname for individuals:

A logic puzzle is a puzzle deriving from the mathematics field of deduction.

Knights and Knaves is a type of logic puzzle.

On a fictional island, all inhabitants are either knights, who always tell the truth, or knaves, who always lie. The puzzles involve a visitor to the island who meets small groups of inhabitants. Usually the aim is for the visitor to deduce the inhabitants' type from their statements, but some puzzles of this type ask for other facts to be deduced. The puzzle may also be to determine a yes/no question which the visitor can ask in order to discover what he needs to know.

Raymond Merrill Smullyan (born May 25, 1919) is an American mathematician, concert pianist, logician, Taoist philosopher, and magician.

Born in Far Rockaway, New York, his first career (like Persi Diaconis a generation later) was stage magic. He then earned a BSc from the University of Chicago in 1955 and his Ph.D. from Princeton University in 1959. He is one of many logicians to have studied under Alonzo Church.

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