TonyMcC Posted January 8, 2011 Posted January 8, 2011 This is an old puzzle, but if you haven't seen it before it should make you think. You stand before two identical doors. On door leads to a long and rewarding life, the other door leads to sudden death. Before each door is a guardian who, if you ask him the correct question will tell you which door to take. However one guardian always lies and the other always tells the truth. You don't know which one lies. You are only allowed one question. You walk up to a guardian and ask him the one question you are allowed and he tells you which door to take. What is your question?
D H Posted January 8, 2011 Posted January 8, 2011 "What would the other guardian's answer be to the question 'What door would leads to a long and rewarding life'?"
TonyMcC Posted January 8, 2011 Author Posted January 8, 2011 "What would the other guardian's answer be to the question 'What door would leads to a long and rewarding life'?" Would you take that door?
D H Posted January 8, 2011 Posted January 8, 2011 No. You take the other door. If you can only take the door that the guardian answers with, you need to ask "What would the other guardian's answer be to the question 'What door would leads to sudden death'?" 1
TonyMcC Posted January 8, 2011 Author Posted January 8, 2011 No. You take the other door. If you can only take the door that the guardian answers with, you need to ask "What would the other guardian's answer be to the question 'What door would leads to sudden death'?"
Doc. Josh Posted January 10, 2011 Posted January 10, 2011 I may be wrong here but i would ask the guardian to reveal whats behind the door he guards. And see for you'r self. If not than i suppose i would ask the guard what door would lead me to hell and then take the oppisite door. so if hes telling the truth i avoid death and if hes lieng i still pick the oppisite and live. Am i right?
TonyMcC Posted January 11, 2011 Author Posted January 11, 2011 No, you have one question and must go through the door you chose. - you can't have a look and change your mind.
Doc. Josh Posted January 11, 2011 Posted January 11, 2011 so you ask the guard, what door would the other guard say is the door of death. Then take the oppisite door, either way should lead you to the door of life..
TonyMcC Posted January 11, 2011 Author Posted January 11, 2011 (edited) . so you ask the guard, what door would the other guard say is the door of death. Then take the oppisite door, either way should lead you to the door of life.. You just died! But you are on the right track. Edited January 11, 2011 by TonyMcC
John Cuthber Posted January 11, 2011 Posted January 11, 2011 . You just died! But you are on the right track. Sure about that? Anyway. Push both guards through their respective doors. Go through the door without screams.
TonyMcC Posted January 11, 2011 Author Posted January 11, 2011 (edited) Sure about that? Anyway. Push both guards through their respective doors. Go through the door without screams. Ask either guard which door the other guard says leads to sudden death. Take that door (not the opposite door). I forgot to tell you the two guards were sumo wrestlers armed with machine guns lol. Edited January 11, 2011 by TonyMcC
radioactive brainbox Posted February 8, 2011 Posted February 8, 2011 would you just ask the gaurd if he/she was a gaurd and the one that lies would say no would he/she not?
TonyMcC Posted February 8, 2011 Author Posted February 8, 2011 would you just ask the gaurd if he/she was a gaurd and the one that lies would say no would he/she not? That is one question - You are not allowed another question. Knowing which guard lies doesn't help you.
John Cuthber Posted February 8, 2011 Posted February 8, 2011 Does anyone know why this makes me think of the phrase "Ugh! I hate beer"?
A Tripolation Posted February 8, 2011 Posted February 8, 2011 (edited) Does anyone know why this makes me think of the phrase "Ugh! I hate beer"? Maybe one time you got drunk off of a few bud-lights, were captured by an evil overlord with access to sumo wrestlers with M16s, a penchant for thought games, a door that was capable of killing anyone that passes through it, and its not-as-cool-as-the-death-door-twin, and escaped? Edited February 8, 2011 by A Tripolation
rktpro Posted July 17, 2011 Posted July 17, 2011 I would pretend that I am Lord Voldemort. I bet they won't dare telling lie. I would pretend that I am Lord Voldemort. I bet they won't dare telling lie.
md65536 Posted July 23, 2011 Posted July 23, 2011 Go through both doors in superposition. Collapse the wavefunction of whichever reality is nicer. 1
TonyMcC Posted July 23, 2011 Author Posted July 23, 2011 I just went up to one of the guards and asked him if the other guard believed any of the alternative solutions would work and he said "Yes, all of them". lol
TonyMcC Posted July 24, 2011 Author Posted July 24, 2011 (edited) I just went up to one of the guards and asked him if the other guard would say that he believed any of the alternative solutions would work and he said "Yes, all of them". lol Edited July 24, 2011 by TonyMcC
uncool Posted July 26, 2011 Posted July 26, 2011 For a slightly stricter question: Assume you in fact only have one guard, not two. This guard either always tells the truth or always lies. What question could you ask him to find out which door to take? =Uncool-
imatfaal Posted July 26, 2011 Posted July 26, 2011 if you go against your nature would you recommend going through this door if I wanted a nice continued life? - and do opposite
uncool Posted July 26, 2011 Posted July 26, 2011 if you go against your nature would you recommend going through this door if I wanted a nice continued life? - and do opposite Heh. That's a little more convoluted than necessary. Can you figure out a simpler question? =Uncool-
imatfaal Posted July 27, 2011 Posted July 27, 2011 but being less convoluted would be going against my nature! I will give it some more thought...
khaled Posted July 30, 2011 Posted July 30, 2011 Simple .. you ask one to ask his friend About the wrong answer .. in any order, it'll be a lie .. it's most similar to Logic Gates. Trying to identify the liar among them is also easy, after knowing the "truth", you simply ask one of them.
MigL Posted July 30, 2011 Posted July 30, 2011 The case of a single guard ( two doors ,one question ) is similar. Ask 'which door would a lier recommend I take', then take the opposite.
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