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Originally Posted by Paradise
??? There are four different variables here: 1) a door that leads to freedom, 2) a door that leads to death, 3) a guard who tells the truth, and 4) a guard who lies.
How do you know which door each guard is guarding? There are four different possibilities, but you can only ask one question to determine which door is the correct one. I still don't see how it works out with one question.
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We'll call them guard A and guard B.
Go to guard A and ask "If I ask guard B which is the safe door, what would he tell me?"
Now if guard A is the liar, he would automatically tell you the wrong door.
But, if guard A is the truth teller, then he would tell you the door that the liar would say, which is also the wrong one.
So you go to the door that he didn't tell you to.