A puzzle created by Dare2Solve caught the attention of many people when it was posted on Reddit AskMath with the title that it stumped the entire math department. This is not too difficult, but it is harder than it first appears.
puzzle creator @Dare2Solve
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Reddit AskMath (see comment by u/zadkiel1089)
www.reddit.com/r/askmath/comments/13qviwb/this_pro…
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