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What is the probability?

 

 Oct 10, 2020
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Here are all the possible rolls. 

 

You want to cover the 9 so you need the two dice to total 9, 10, 11, or 12. 

 

How many of those are there?  Looks like there's 10 rolls that will work. 

 

1,1   1,2   1,3   1,4   1,5   1,6  

2,1   2,2   2,3   2,4   2,5   2,6  

3,1   3,2   3,3   3,4   3,5   3,6  

4,1   4,2   4,3   4,4   4,5   4,6  

5,1   5,2   5,3   5,4   5,5   5,6  

6,1   6,2   6,3   6,4   6,5   6,6

 

Since there are 36 possible rolls, and 10 of them are suitable, the odds are 10/36 or if you want to reduce it, 5/18

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 Oct 10, 2020

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