You are in a dungeon with five doors. In the dungeon there are two dungeon keepers, who are both either a liar or a knight. You know there is one liar and one knight. One door leads out of the dungeon, the other to certain death.

The keepers then tell you the following information:
Keeper A: If you asked me what door to take, there is no chance I would say E. If you asked the other keeper what door to take, he might say B.

Keeper B: If you asked me what door to take, there is no chance I would say C. If you asked the other keeper what door to take, he might say A.

Which door is the correct one?

Since both keepers are effectively saying the same thing, and the door letters can be swapped about, it can only possibly be the door they are not talking about.

Posted by Dacre on 2003-08-29 12:06:08