Logic Puzzles
7. You are in a room with 2 doors -- one leads further into the
dungeon, one leads to freedom. There are two guards in the room,
one at each door. One always tells the truth. One always lies.
What one question can you ask one of the guards that will help
you pick the door to freedom?
Solution: If you just wanted to
determine which one tells the truth and which lies, you would
ask: If I were to ask the other guard whether you always tell
the truth, what would he say? A reply of no means you are
talking to the truth teller, a reply of yes means you are
talking to the liar. So since you only have one question to
select the right door, you would have to ask If I were to ask
the other guard, which door would he say leads to freedom? You
would then select the door opposite
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