The Genii Forum

Here is an old logical problem that can be done as a mindreading trick but what is the question?

Suppose you come to a cross road one goes to hell and one goes to paradise but you dont know which is which.

But you are lucky or are you there are two peole present a saint that allways tells the thruth and a devil that allways lies but again you dont know which is which.

You are allowed one question.

What is the question?

"If I was to ask the other person which is the way to paradise what would they say?"

The opposite to the answer they give is paradise.

Or:
"If someone asked you which is the way to paradise, what would your answer be?" - the answer will always be true :D

Banachek has an interesting presentation based on this. The principle is neatly disguised.

If you enjoy this sort of thing, I highly recommend the books of Raymond Smullyan.

Matt Field

Thanks for the response seems that some of you are ending up in a hot place...

Let's all go to hell in a handbasket!

Heaven for the climate, hell for the company. :D

brian :cool: