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?

Guest Jul 28, 2021

#1**+1 **

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

ElectricPavlov Jul 28, 2021

#2**0 **

*** 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