the probability is 5/6
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This probability is (1/6)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.
1/6
If you're only rolling one die, it's a probability of 1 out of six, or 16.67%.
It is 0.9459