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Two two-digit counting numbers (from 10 to 99, inclusive) were chosen randomly.These two integers could be the same or different. What is the probability that thedifference between these two numbers is at most 3?

 Mar 7, 2021
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The probability is (96 - 10 + 1)/c(90,2) = 29/1335.

 Mar 8, 2021

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