[Benjamin]

Originally Posted by LiamPRW

You approach two talking doors.
One door leads to the City of Truth, while the other door leads to the City of Liars.
You do not know which door is which. You are able to ask only one question to determine which door is which.
The door that leads to the City of Liars always speaks lies, while the door that leads to the City of Truth always speaks the truth.
You want to go to the City of Truth.
What question do you ask to determine which door leads to the City of Truth?

You would ask one of the doors what the the other door would say and then tale the opposite one.