Seven Perfect Shuffles Randomize a Deck of Cards. But How Many Sloppy Ones?

A decades-old proof showed that seven shuffles are enough to mix up a deck of cards. But it requires you to cut the deck with the precision of a professional magician. A new proof gets around that obstacle. The post Seven Perfect Shuffles Randomize a Deck of Cards. But How Many Sloppy Ones? first appeared on Quanta Magazine

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