SOLUTION: if x is an integer chosen at random from the set {2,11,19,31,51} and y is chosen at random from the set {1,7,18,19,31}.What is the probability that the product xy is a prime factor

Question 1017197: if x is an integer chosen at random from the set {2,11,19,31,51} and y is chosen at random from the set {1,7,18,19,31}.What is the probability that the product xy is a prime factor?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
if x is an integer chosen at random from the set {2,11,19,31,51} and y is chosen at random from the set {1,7,18,19,31}.What is the probability that the product xy is a prime product ?
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Prime products:: 1*2 , 1*11, !*19, 1*31
None of the other products will be prime.
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P(xy is prime) = 4/(5*5) = 4/25
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Cheers,
Stan H.
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