You are in a room with two doors. If you leave through one of the doors, you will die. If you leave through the other door, you will live. Of course you dont know which door is which. There is a guard standing in front of each door. One of the guards always tells the truth. The other guard always lies. Of course you also dont know which guard is standing in front of which door.
Now in order to determine which door is the correct way out (assuming you want to live), you are allowed to ask only one question. You may pose your question to either of the guards, but only one of them. What is the question you can ask that will determine with 100 certainty, that you will leave through the correct door?
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