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May 28, 2015

Homework Help: math

Posted by Yuan on Monday, March 19, 2012 at 1:02pm.

A four-digit number is selected at random. What is the probability that its ones place is greater than its tens place, its tens place is greater than its hundreds place, and its hundreds place is greater than its thousands place? Note that the first digit of an n-digit number is nonzero.

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