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a is chosen from the set {1,2,3,4,5}, and b is chosen from the set {5,6,7,8,9}. What is the probability that the product ab is a prime number?

 Jul 28, 2021
 #1
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The only ab from the set that would be a prime number would be   1 * 5     or   1*5   out of 25 possible products.

 Jul 28, 2021
 #2
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*** edit ***   answer does not change

 

The only ab from the set that would be a prime number would be   1 * 5     or   1*7   out of 25 possible products.

ElectricPavlov  Jul 28, 2021

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