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The Number Seven (28 Oct 2003)
n 1990, American mathematicians Persi Diaconis and David Bayer suggested that 7 shuffles are sufficient to achieve an acceptable degree of randomness in a deck of 52 cards. With 6 or fewer shuffles, the original order of the cards is still strongly in evidence and beyond 7, nothing is gained in terms of increased randomness.
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  14.48    (Another 5 Numbers)  

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