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What is the probability that a two-digit number selected at random has a tens digit less than its units digit? Express your answer as a common fraction.

Darkside  Sep 3, 2018
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There are: 99 - 10 + 1 =90 2-digit numbers between 10 and 99.

There are: 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 =36 numbers whose tens digit is LESS than its units digit.

36 / 90 =40% probability

Guest Sep 3, 2018

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