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What's the most difficult riddle to solve in the world?

Asked by luigirovatti (2837points) February 19th, 2018

I DON’T mean a game like chess or tic-tac-toe, and I DON’T mean riddles like this:

https://www.riddles.com/archives/5831

I mean a puzzle, a question that involves LOGIC and/or MATHEMATICS.

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