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2 posts tagged with math by andoatnp.
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If that sounds like it makes no sense that's because... well, it doesn't

This Simple Math Puzzle Will Melt Your Brain
"Adding and subtracting ones sounds simple, right? Not according to the old Italian mathematician Grandi—who showed that a simple addition of 1s and -1s can give three different answers."
posted by andoatnp on Jul 2, 2013 - 61 comments

Magic numbers: A meeting of mathemagical tricksters

"Gary Foshee, a collector and designer of puzzles from Issaquah near Seattle walked to the lectern to present his talk. It consisted of the following three sentences: "I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?"" [more inside]
posted by andoatnp on May 25, 2010 - 233 comments

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