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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?

 Jun 16, 2022
 #1
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          5     6    7     8    9

1        5     6    7    8     9

2      10    12   14  16   18  

3      15    18  21   24   27

4      20    24  28   32   36

5      25    30  35   40   45

 

We have 25 outcomes.....only 2 are prime

 

So

 

2 / 25 

 

 

cool cool cool

 Jun 16, 2022

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