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# Can someone explain this to me

Banned
Always confused me.

Its things like what happen in the Labyrinth film when shes got a choice of 2 doors

One leads to certain doom and other right to castle.

Theres 2 guards 1 tells the truth one lies.

She can only ask one question in order to find the right one.

How does she work out which one it is and which one is lying.

She is female they know everything :thumbsup: :oops:

It has nothing to do with which one is the liar and which one is being truthful. The trick is to get them to give the same kind of answer. And here's how you do it. You have one truthful guard and one lying guard. If you ask the truthful guard if the other guard (liar) would say the door you're pointing at would lead to the caste he'll truthfully tell you what the liar would say because you're asking the truthful one what the lair would say. So you get the lie as his answer by default. He is truthfully quoting the liar. If you ask the liar if the other guard (truthful) would say if the door you are pointing at leads to the castle the liar would NOT tell you honestly what the other door would say. He would tell you the lie because he is the lair. So you get the lie by default.

Either you're asking an honest person what a liar would say or you are asking a liar what an honest person would say. As a result you always get the lie as the answer. It's really very simple. If you ask one door what the other door would say (nevermind which one's truthful or lying) you will automatically get the lie as the answer by default.

Original Poster Banned

But there is only 1 question allowed not one each so its hard, I guessed that you have to trick them.

In the movie thats like what she did, she asked one of them if the other would tell her that the first door would lead to the castle and then then chose the other door than what she was told.

thesaint;2414147

correct.:thumbsup:

but id worked it out before when i watched it but couldnt be bothered to write it out

Banned

but you dont know which one is the truthfu guard and which one is the liar do you?

sassie;2414167

but you dont know which one is the truthfu guard and which one is the … but you dont know which one is the truthfu guard and which one is the liar do you?

You don't need to, the OP's question isn't quite correct

Original Poster Banned

Yeah its been a few years since I saw it complete last but its always confused me lol.

You have only 1 question in total not one each. One of the guards will lie one wont.

Each stands in front of a door, one leads to castle one to certain doom.

She needs to find out which door goes to the castle but she doesnt know which one will lie so needs to use her 1 question to find out the correct door by catching out one of them.

Banned

so cant she just ask them her name or are the guards not assigned to a door

thesaint;2414147

ppd_2001;2414137

She is female they know everything :thumbsup: :oops:

:giggle:

im confuzzled....can sonmoeone jus repeat the dialouge that was used?!

ok here it goes

* you have 2 doors one leads to heaven (A) and one leads to hell (B)
* a man wants to get to heaven but doesnt know which door leads where
* there are 2 gate keepers who both know which door is which, but one will always lie to him and one will always tell the truth.
* the man can ask one question to determine which door is which.
* the question the man should ask is " if i ask the other gate keeper which door to take, what would he tell me."

this works because

*if he asks the liar this question, the liar will lie and say that the truthfull gate keeper will say door B.
*if he asks the truthfull gatekeeper this question, he will tell the truth and say that the liar will lie and say door B.

so the man takes door A and goes to heaven.

god i must be bored this morning.

Your all forgettng though, she chose the wrong door and got molested by a load of hands.

masterbrown;2415063

Your all forgettng though, she chose the wrong door and got molested by a … Your all forgettng though, she chose the wrong door and got molested by a load of hands.

I assume you're talking about Amy Winehouse. :-D

Just to add more confusion... when one of the guards says "One of us always tells the truth, one of us always tells a lie", how does she know THAT guard isn't lying and in fact they both always lie?