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Riddle: Stuck in a room

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dlseven777
I've posed this riddle to many children and rarely would anyone get the answer. But here it is.

You wake up one day and find yourself trapped in a room. There are two other people in there with you. And also there are two doors.

One of the doors will lead to death and the other to life. Your objective is to find the door of life, but you don't know which is which.

Your only chance is the oppurtunity to ask one and only one question. This question can only be asked to one of the other people in the room. One will always lie. And the other will always tell the truth.

What question can you ask to find the correct way out, to life.

I know the answer and will post my responses to those that post their answers.
qscomputing
WARNING SPOILER FOLLOWS



Approach either one, point to one of the doors and ask "If I asked the other guy which door is the way to life, would he tell me this one?"

If he says "no", then you have picked the right door. If he says "yes", then you have picked the wrong door. You now know the way out.[/b]
imagefree
qscomputing wrote:
WARNING SPOILER FOLLOWS



Approach either one, point to one of the doors and ask "If I asked the other guy which door is the way to life, would he tell me this one?"

If he says "no", then you have picked the right door. If he says "yes", then you have picked the wrong door. You now know the way out.[/b]


if the man you are askig is a lier and the door you are pointing is death door, the solution doesnt apply. ( may be it doesnt apply on all other cases).
Yantaal
i would ask this

will you please walk through tat door for me, then follow if he livesm, then use other if he dies
qscomputing
imagefree wrote:
if the man you are askig is a lier and the door you are pointing is death door, the solution doesnt apply. ( may be it doesnt apply on all other cases).


Yes, it does work. The liar knows that the truth-teller will always give the correct answer to the question. As the liar always lies, he will always give the wrong answer when asked what the truth-teller would say.

The truth-teller knows that the liar will always give the wrong answer to the question, so he gives the wrong answer when asked what the liar would say.

Hence, no matter which door and which man you pick, you will always get the wrong answer to the question "does this door lead to life?".

HTH.
dlseven777
qscomputing got it right.

my answer to the solution is: "Point to the door the other person would select as the door of life"
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