I heard this many years ago but was reminded of it this morning...
You are trapped in a room that has two doors. One door leads out of the room and the other door goes nowhere. There are two other people in the room with you. One of these pepople always lies and the other always tells the truth. Each of them knows which is which but, of course, you do not. In addition, each of these two people know which door leads out of the room. You are allowed to ask one question to either of these two, the answer to which must lead you to the door that will allow you to leave the room. The question cannot be a multi-part question. What is the question?
You are trapped in a room that has two doors. One door leads out of the room and the other door goes nowhere. There are two other people in the room with you. One of these pepople always lies and the other always tells the truth. Each of them knows which is which but, of course, you do not. In addition, each of these two people know which door leads out of the room. You are allowed to ask one question to either of these two, the answer to which must lead you to the door that will allow you to leave the room. The question cannot be a multi-part question. What is the question?