Answer for the puzzle.
Since you don't know which gate leads to heaven and which one to hell, and also don't know who tells the truth and who tells the lie, you have to put a question to one of the guards asking him what the other guard will point out to the gate, if he is asked to show the gate of heaven. When the guard points out to that gate, you simply choose the other gate that lead you to heaven.
TS.Venkataraman
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