Probability

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Probability

by danjuma » Thu Dec 09, 2010 11:57 am
What is the probability of getting a sum of 8 or 14 when rolling 3 dice simultaneously?

1.1/6
2.1/4
3.1/2
4.21/216
5.32/216
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by goyalsau » Thu Dec 09, 2010 12:24 pm
danjuma wrote:What is the probability of getting a sum of 8 or 14 when rolling 3 dice simultaneously?

1.1/6
2.1/4
3.1/2
4.21/216
5.32/216
In three dice there will be 6 * 6 * 6 = 216 cases.

8 Can be achieved in 1 1 6 , 1 2 5 , 1 3 4 , 2 2 4 , 2 3 3 ,

14 Can be achieved in 4 5 5 , 4 6 4 , 5 6 3 , 6 6 2 ,

Every Case be arranged in !3 ways,

so in all 9 cases & !3 ways, = 54 cases.

54/216 = 1/4
Saurabh Goyal
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