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The Problems with Secret Santa - Numberphile

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Dr Hannah Fry discusses Secret Santa, anonymity and derangements. And a better way to do it.
More Hannah on Numberphile: http://bit.ly/hannah_vids
Hannah's co-written Xmas book: http://amzn.to/2g8mIn6
Hannah's love/math book: http://bit.ly/frylovebook
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Hannah on Objectivity: https://youtu.be/ayzKlPIcRKU

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Videos by Brady Haran
Artwork and animation in this video by Pete McPartlan

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