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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?

 Aug 18, 2020
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Looks like   4 x 5 = 20 possibilities

    only primes would be the primes in set 2   x    one   =====   5  0r 7 

2 out of 20 = 1/10 = .1    or 10%

 Aug 18, 2020

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