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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.
It depends on what the experiment is.
The probability is 1/6 x 1/6 = 1/36.
The probability is 1, if the dice are rolled often enough.
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.