Posted by **Diane** on Sunday, August 29, 2010 at 11:02pm.

What is the probability of the sum of two fair dice equals a prime number when rolled once?

- Probability -
**Reiny**, Sunday, August 29, 2010 at 11:14pm
So we are looking for a sum of

2,3,5,7,or 11

number of ways for 2 is 1

number of ways for 3 is 2

number of ways for 5 is 4

number of ways for 7 is 6

number of ways for 11 is 2

so prob for a prime = (1+2+4+6+2)/36 = 5/12

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