1 out of 6 or 1/6
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If its a fair dice 1/6
Zero is the probability of rolling a sum of 15 on two fair dice; the maximum value is 12.
If the die is fair, then 1/6.
The probability of not rolling a sum of six with two fair dice is 1 minus the probability of rolling a sum of six. There are 36 permutations of rolling two dice. Of these, five sum to six, 1+5, 2+4, 3+3, 4+2, and 5+1. The probability, then of rolling a sum of six is 5 in 36. The probability, then of not rolling a sum of six is 31 in 36, or about 0.8611.
Assuming fair normal dice, the probability is 1/216.