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Two numbers are independently selected from the set of positive integers less than or equal to 5. What is the probability that the sum of the two numbers is less than their product? Express your answer as a common fraction.

 
ANotSmartPerson  Oct 12, 2018
 #1
avatar+89998 
+2

We have  C(5,2)   = 10 pairs

 

They are 

 

1,2    1,3    1,4   1,5

2,3    2,4    2,5

3,4    3,5    

4,5

 

The pairs in red have sums < their products

 

So..the probability is   6 / 10    =  3 / 5

 

 

cool cool cool

 
CPhill  Oct 12, 2018
 #2
avatar+53 
+2

Thanks!

 
ANotSmartPerson  Oct 12, 2018

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