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

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

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