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All the natural numbers from 1 to 100 are placed in a hat. Two are drawn at random without replacement. What is the probability of getting 2 numbers containing the digit 9 in the ones place?

 Apr 16, 2020
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The numbers with a digit of 9 in the one's place are:  9, 19, 29, 39, 49, 59, 69, 79, 89, and 99.

 

The probability of getting the first number with a 9 in the one's place is 10/100.

The probability of getting the second number (without replacement) with a 9 in the one's place is 9/99.

 

To find the final probability, multiply these numbers together:  10/100 x 9/99  =  ...

 Apr 16, 2020

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