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April 9th, 2009, 03:48 AM   #1
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Statistics

What is the probability that a 10 digit number does not have four distinct digits?
i.e. calculate the probability that the 10 digit number has at most three distinct digits

Distinct digit = not occurring in the 10 digit number more than once
ex: 10 digit number 6677564492
distinct digits = 5, 2, 9
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