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TIME: Almanac 1990s
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1994-03-25
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<text id=90TT0209>
<title>
Jan. 22, 1990: Big Deal
</title>
<history>
TIME--The Weekly Newsmagazine--1990
Jan. 22, 1990 A Murder In Boston
</history>
<article>
<source>Time Magazine</source>
<hdr>
PEOPLE, Page 62
Big Deal
</hdr>
<body>
<p>By Emily Mitchell/Reported by Wendy Cole
</p>
<p> 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."
</p>
</body>
</article>
</text>