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?
+37159 The only ab from the set that would be a prime number would be 1 * 5 or 1*5 out of 25 possible products.
+37159 *** 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.
