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2. One of the two guards always tells the truth. The other guard always lies. Unfortunately, it is impossible for you to distinguish between the two guards.
You have permission to ask one guard one question to ascertain which path leads to Paradise.
Remember that you do not know which guard you're asking -- the truth-teller or the liar -- and that this single question determines whether you live or die.
The question is:
What one question asked of one guard guarantees that you are led onto the path to Paradise,
regardless of which guard you happen to ask?