The sum of the probability of success and the probability of failure
had better equal 1.00 (100%) or an error has been committed.
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The answer depends on the sum of WHAT!
Probability that the sum is 6 = 5/36 Probability that the sum is 7 = 6/36
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.
The probability of getting a sum of 2 at least once is 0.8155
The probability is 21/36 = 7/12