- "Which door would the other guard say leads to freedom?" (Then choose the opposite door).
- "Which door leads to freedom?"
- "Do you always tell the truth?"
- "Are you the lying guard?"
Question: There are two doors, one leads to freedom and the other to danger. In front of the doors are two guards, one who always lies and one who always tells the truth. You can ask one question to one guard. What question do you ask?
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