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FOR KIDS: Shuffling shenanigans

A magician-turned-mathematician figures out how many times to shuffle a deck of cards before playing Old Maid

View the question sheet / student exercises at the bottom of this article.

When Persi Diaconis was a kid, his favorite hangout was the magic store. He and his friends goofed around, practiced their tricks and longed for the books and tools.

Then one day, in walked the world’s greatest living magician.

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