Question

You are trapped in a room with two doors. One is to death and other lds to freedom. You don't know whic 1. There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.You can, however, ask one robot one question. The problem is one robot always tells the truth ,the other always lies and you don't know which is which.What is the question you ask?

Answer 1

http://www.mindchallenger.com/p2answer.html

(Admission: I cheated and looked it up with Google.)