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a is chosen from the set {1,2,3,4} and b is chosen from the set {5,6,7,8,9,10}. what is the probability that the product ab is a prime number

 Sep 27, 2021
 #1
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There are   4 x 6 = 24 possible combos of a and b

   the only primes would be   1 * 5     1*7        two out of 24  = 1/12

 Sep 27, 2021

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