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There are 36 permutations of two dice. Of those, 9 add up to a sum of 5 or 6...

1 + 4 = 5

2 + 3 = 5

3 + 2 = 5

4 + 1 = 5

1 + 5 = 6

2 + 4 = 6

3 + 3 = 6

4 + 2 = 6

5 + 1 = 6

The probability, then, of rolling a 5 or 6 with two dice is 9 in 36, or 1 in 4, or 0.25.

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