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This Simple Math Puzzle Will Melt Your Brain

"Adding and subtracting ones sounds simple, right? Not according to the old Italian mathematician Grandiâ€”who showed that a simple addition of 1s and -1s can give three different answers."

posted by andoatnp on Jul 2, 2013 - 61 comments

"Adding and subtracting ones sounds simple, right? Not according to the old Italian mathematician Grandiâ€”who showed that a simple addition of 1s and -1s can give three different answers."

posted by andoatnp on Jul 2, 2013 - 61 comments

"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

posted by andoatnp on May 25, 2010 - 233 comments

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