Two Guards

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Moriarty is kept in a cell in Scotland Yard with two doors, each guarded by a policeman. One door leads to freedom, the other to certain death. Moriarty is allowed to open a door and ask only one question of one of the two guards, knowing that one guard always tells the truth and the other one always lies.

Which question should Moriarty ask?

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Answer to previous riddle: The match.

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