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More probability --- Source unknown

Expert replies
by wizardofwashington » Thu Sep 13, 2007 4:10 pm
31. What is the probability of getting a sum of 12 when rolling 3 dice simultaneously?

a) 10/216
b) 12/216
c) 21/216
d) 23/216
e) 25/216

OA, as noted is E
A falling tree resounds... but a forest grows in silence...
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Source: — Problem Solving |

by Neo2000 » Thu Sep 13, 2007 5:52 pm
Total number ot outcomes = 6x6x6 = 216

Total number of ways of getting 12
4,4,4 = 1
6,4,2 = 6
6,5,1 = 6
6,3,3 = 3
5,4,3 = 6
5,5,2 = 3

Total = 25

Probability = 25/216
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