Math

Riddle For Genius – When Does The Thief Tell The Truth?

There’s a short warm-up puzzle followed by the main puzzle. Thanks to Greg in Hungary (warm-up) and Jorn in Holland for suggesting these problems!

*In my original video, I solved for day 3 with AND but mistakenly wrote “OR”. Interestingly the OR is much easier to solve, and the answer works out to the same day. But I prepared this corrected video to be as accurate as possible.

References
https://math.stackexchange.com/questions/730450/a-strange-lier-that-tells-truth-on-7th-day-of-the-week
http://www.coolinterview.com/interview/4518/
http://www.briddles.com/2012/10/popular-liar-truth-riddle.html
https://gpuzzles.com/mind-teasers/statement-puzzle/

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