When Goren begins seeing the psychologist, he tells her a riddle.
If I have it wrong, please correct me.
The riddle:
Two guards, each in front of a door.
One door leads to heaven, the other to hell.
One guard to heaven tells the truth, the other one lies.
You can ask one guard one question, what would it be?
The answer:
What would the other guard say, if his is the door to heaven?
Could someone explain it?
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~~~ChuLinNYC~~~
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You ask Guard 1 what Guard 2 would say if his is the door to Heaven. Regardless, the answer will be a lie.
Guard 1: Guard 2 will tell you his door is the door to Heaven.
(Guard 1 tells the truth; Guard 2 is lying. Therefore, his door is not the door to Heaven.)
(Guard 1 is lying; Guard 2 is telling the truth. Therefore, his door is not the door to Heaven.)
Guard 1: Guard 2 will tell you his door is not the door to Heaven.
(Guard 1 tells the truth; Guard 2 is lying. Therefore, his door is the door to Heaven.)
(Guard 1 is lying; Guard 2 is telling the truth. Therefore, his door is the door to Heaven.)
I wonder if logicians would consider this a fallacious logic puzzle, since the truth teller is lying by proxy.
First rule of Demon Dean: Do not talk about puppy phobia.
Truth teller would say "it's the door to hell"
The liar would say, "it's the door to hell."
Swing away, Merrill....Merrill, swing away...share
Like the doorknockers in the labyrinth.
shareFrom an uncredited imdb user:
The riddle is solved by asking either guard which door the other guard would tell you to enter, and then doing the opposite.
The one who always tells the truth will tell you that the one who always lies would tell you to enter the door to hell, since that would be his lie. The one who always lies would falsely tell you the one who tells the truth would point you towards the same door, meaning you shouldn't believe him and should pick the opposite door.
"All you need to start an asylum is an empty room and the right kind of people."
Still plain as mud, I've wrestled with this one forever and this is the only way it makes sense to me, but you have to go the long way around it.
Ask the honest guard, 'which door would HE tell me to pick?', and he said would 'He would say HIS door', ask the lying guard 'which door would HE tell me to pick?', and then it kind of comes together, since he always lies, he COULDN'T say 'he would tell you to pick HIS door', because that's the truth, and he couldn't say 'He would tell you to pick MY door' because he wouldn't do that if it was true. But you have to actually think it all out to put it together, otherwise it just seems like each will still point the finger at the other no matter what you ask them.
But you don’t know which guard is guarding Heaven’s door or Hell’s door. 🤷🏼♀️ How do you know which one is the honest guard??
shareHow do you know which one is the honest guard??
If you ask the truthful guard, his answer would be ‘no’. If you ask the liar, he’d say ‘no’. So you always pick the opposite door.