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Three integers are chosen at random without replacement from the first 20 positive integers. What is the probability that their product is even?

 Jun 18, 2022
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20 C 3 ==1,140 combinations

 

My computer says there are 1,020 combinations whose products are EVEN.

 

Then, the probability is ==1,020 / 1,140 == 17 / 19

 Jun 18, 2022

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