Heaven or Hell Puzzle

on Monday, 8 October 2012
This is one of the classic puzzles asked in interviews nowadays.

You are standing before two doors.One door leads to the heaven and the other leads to Hell but you don't know what hides behind the doors. There are two gatekeepers. You know one of them always tells the truth and the other always lies, but you don't know who is the honest one and who is the liar.

You can only ask one question to one of them in order to find the way to heaven. What is the question?

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