The probability is 25/216 = 0.1157, approx.
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1 in 9
The answer depends on what sort of dice you roll and how many.
A sum of 9 with 2 dice can be achieved with 3+6, 4+5, 5+4, and 6+3, so there are 4 elements in the event space for a sum of 9. This corresponds to a probability of 4 in 36, or 1 in 9, or about 0.1111 for that result.
1/9
Prob(Sum = 5) = 1/9