+0  
 
+1
212
1
avatar+113 

The faces of two dodecahedra are labeled with the numbers 1 to 12 in order to make dice. If these dice are rolled, what is the probability that the sum of the two top numbers is greater than 12?

jonathanxu999  Feb 9, 2018
 #1
avatar+92816 
+1

There will  be   12 x 12   = 144 possible outcomes

 

Outcome     Frequency      

 

2                    1                

3                    2

4                    3

5                    4

6                    5

7                    6

8                    7

9                    8

10                  9

11                10

12                11

                  ____ 

                    66

 

So....... the probaility of a number  >  12  =  

 

[ 144  - 66 ]   / 144  =

 

78 / 144  =  

 

39 / 72   =

 

13 / 24

 

 

 

cool cool cool

CPhill  Feb 9, 2018

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