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What is the probability that the two digits in a randomly selected two digit positive integer ( that is, an integer between 10 and 99) are the same?

 Jun 3, 2020
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If I understand your question:

How many integers are there between 10 and 99?

 

99 - 10 + 1 = 90 integers

 

How many 2-digit integers are there that are the same? Well, you have: 11, 22, 33, 44, 55, 66, 77, 88, 99 =9 integers

 

So, Probability of picking an integer with the same 2 digits =9 / 90 = 1 / 10.

 Jun 3, 2020

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