Rolling dice, there are 62 or 36 outcomes.
There is only 1 way to get a 12; 6 & 6.
Therefore, the probability is 1/36 or 0.0278.
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Zero is the probability of rolling a sum of 15 on two fair dice; the maximum value is 12.
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.
5 in 36
The probability of rolling a sum of 12 in a single roll of two dice is 1 in 36, or about 0.0278.
The probability is 1, if the dice are rolled often enough.