The sum with the highest probability is 7. The probability of rolling a 7 is 6/36 = 1/6.
The various sums and the number of ways they can be formed is listed here. The probability of any sum is the number of ways it can be formed divided by 36, the total number of outcomes. Sum - Ways 2 - 1 3 - 2 4 - 3 5 - 4 6 - 5 7 - 6 8 - 5 9 - 4 10 - 3 11 - 2 12 - 1
The various sums and the number of ways they can be formed is listed here. The probability of any sum is the number of ways it can be formed divided by 36, the total number of outcomes. Sum - Ways 2 - 1 3 - 2 4 - 3 5 - 4 6 - 5 7 - 6 8 - 5 9 - 4 10 - 3 11 - 2 12 - 1