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The classic riddle has the caveat that you are only allowed to ask one question so how is asking “what’s 2+2?” going to let you know which door to take?
Alternatively: the one that explained the riddle is a liar, and they both lie.
Is it just one question or one question per?
Just the one question. Here is the wiki on this riddle: https://en.wikipedia.org/wiki/Knights_and_Knaves
Relevant xkcd:
What if G1 is lying and both of them always tell lies?
Or the “only” part is the lie?
