The 2 Doors
Answer(1): Ask a a door - "If I were to ask the other door which door leads to the city of truth, what would he say". And then you pick the opposite door of what he tells you.
Answer(2): Ask the door - "If I asked you which door leads to the city of truth before, which door would you have told me?" (negative and negative = positive, positive and positive = positive). and you choose the door that it directs you to.
Answer(3): Ask a a door - "Do both doors lead to the city of truth?" If the answer is no, it's the truth door. if the answer is yes, it's the liars' door.
These are confusing solutions, so read it over if you don't understand them.
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