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Merry Christmaths: the statistics of Secret Santa

  • Written by Rheanna Mainzer, Melbourne Early Career Academic Fellow (Statistics Tutor), University of Melbourne
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Last Christmas, my family gathered to organise our Kris Kringle. My sister drew her husband, but they were already buying presents for each other, so we decided to draw again. No one in my family (except me) is particularly interested in mathematics or statistics, but my brother fatefully asked:

What are the chances that all...

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