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All possible outcomes: 2,3,4,5,6,7,8,9,10,11,12

All possible outcomes that are prime: 2,3,5,7,11

All possible rolls that are one of these prime numbers:

--1-2-3-4-5-6

1.*.*....*....*

2.*....*....*...

3....*....*......

4.*....*.........

5....*..........*

6.*..........*...

So we count 15 possible ways to make a Prime number.

P = (# of correct outcomes) / (# of total possible outcomes)

P = 15 / (6*6) = 0.416667 or 5/12

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16y ago

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