Another one !
You are in a room in which there are two doors A and B.
One of the two doors is the door of Paradise, the other one is the door of Hell.
There is a guard in front of each door.
One of the two guards always says the truth, on the other hand, the other guard lies continuously.
The two guards know each other very well and both of them know which is the Paradise door and which is the Hell door.
You have the right to ask one and only one question to one of the two guards in order to determine with exactitude which is the door of Paradise, door A or door B.
Which is this question ?
That's a famous one <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> There's a variation on it though, which is quite a bit tougher. I'd have to look up the answer myself, cause I've forgotten it and I don't feel like trying to figure it out for myself again. Btw, I never found it myself <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
So you thought the monks were difficult eh?... <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
You are in a room with four people, of which two always lie and two always speak the truth. You have to find out which of the two are the liars, and which are the truth-tellers.
You may ask exactly two questions, each addressed to only one person. They have to be yes-or-no questions. It doesn't matter who you ask your questions to (you may ask the same person two questions if you want), or whether you ask two different questions or twice the same question -- do as you please.
Also, each of these people knows from the others whether they are liars or truth-tellers.
You're not allowed to kill these people out of frustration when you don't find the answer <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" /> (that last sentence is not part of the riddle <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" /> )
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