this post was submitted on 01 May 2024
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[โ€“] WhiskyTangoFoxtrot@lemmy.world 7 points 2 years ago (1 children)

The truth is that the whole setup is moot if it's one of the door-guards that tells you the rules, since they might be lying about the whole thing. There needs to be a trusted third-party involved, who knows about the guards but doesn't know which one's lying and which one's telling the truth.

[โ€“] dalekcaan@lemm.ee 5 points 2 years ago

True. It seems there are different versions of the puzzle, but from a quick search it was popularized by the movie Labyrinth, and there they get around it by having a second set of guards who don't know the answer explain the setup.