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Suppose we choose 2 integers from 1, 2, 3, ..., 9.  What is the probability that they are both odd?

 Jun 23, 2020
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The odd integers in this set are 1, 3, 5, 7, and 9.

The probability of the first integer being odd is 5/9.

The probability of the second integer being odd is 4/8=1/2.

 

So the probability they are both odd is 5/9 * 1/2= 5/18.

 Jun 23, 2020

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