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# In the &quot;1 man lies and the other tells the truth&quot; riddle, couldn't you just ask one a simple math question? Answered

IE, a question YOU know the answer to??

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## Discussions

Yes you could, that's a good piece of logic.
However, in the riddle you need to find out the answer to a question which isn't math'. If you had two questions it would work, but you only get one.

The answer is a simple binary / boolean:
If person A outputs FALSE where it should be TRUE and person B outputs TRUE for TRUE, you ask "what would the other person answer to this question?" It assumes that persons A and B know each other and their logical-operation. But the outcomes are :

A would say (TRUE but I do FALSE for TRUE so- ) I say FALSE" or B (I know B will say FALSE so- ) FALSE. You get the same TRUE answer regardless of which person you ask. It works the by logically cancelling out a common uncertainty factor or something like that...

L

Yes, it would work because you would easily be able to identify the liar, however, in most versions of this question you are only allowed to ask a single question. Which means you can easily identify the liar but you never asked about the two cities (or whatever the riddle is about), therefore you do not get a useful answer.

That being said, if you have 2 questions, that is an easy solution.