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- PEOPLE, Page 62Big Deal
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- By EMILY MITCHELL/Reported by Wendy Cole
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- How many shuffles will thoroughly mix a deck of cards? The
- world wasn't exactly waiting for an answer, but Columbia
- University mathematician DAVE BAYER wanted one anyway. He and
- Harvard mathematician Persi Diaconis observed thousands of
- shuffles and used several computers. After analyzing a deck's
- possible permutations (1068), they found the magic number:
- exactly seven shuffles ensure true randomness. A veteran poker
- hand, Bayer, 34, won't use his knowledge at the gaming table
- because "my job is to explain the problem. Others can try to
- take advantage of it."
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