On this post: Two doors with two guards - one lies, one tells the truth the most common answer for this riddle is given.
However, while the answer marked as correct is the most common solution I found, it does not seem correct to me. It, as with others in the thread I linked, seem to contradict the initial logic of the riddle. I have not come across the solution I came up with anywhere, so I'm curious if my logic is wrong, or if I'm just dense. Both of which are entirely possible.
This is the original riddle in the most common form I've seen, identical to OP in linked thread...
You are a prisoner in a room with 2 doors and 2 guards. One of the doors will guide you to freedom and behind the other is a hangman -- you don't know which is which.
One of the guards always tells the truth and the other always lies. You don't know which one is the truth-teller or the liar either.
You have to choose and open one of these doors, but you can only ask a single question to one of the guards.
What do you ask so you can pick the door to freedom?
The most common solution is:
If I asked what door leads to freedom, what door would the other guard point to?
I've seen this solution everywhere, but my problems with it are that..
It assumes that the guards will point to doors instead of only responding verbally. Which isn't indicated in the riddle.
If we ask this of the truth-guard he will point to the death door, however if we ask the same question of the liar-guard he will point to the freedom door. Otherwise he would be telling the truth about which door his counter part would point to. In essence depending on which guard we asked that question, they would still point to different doors.
Maybe I'm being super dense here, but it seems that doesn't tell us what door to walk through, and a better solution would be to walk up to either guard and ask
Would 'you' walk through this door to freedom?
With this question no matter which guard you ask, if the answer is yes you choose the door you indicated when asking the question. If the guard answers no you choose the opposite door.
Sorry for the long post, but thanks in advance for any responses.