You are standing before two doors. One of the path leads to heaven and the other one leads to hell. There are two guardians, one by each door. 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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Answer: The question you need to ask is - "If I ask the other guard which is the door to heaven, which door will he point me to?"