well if there are 12 outcomes and all are different lets think. How many possibilities are there of rolling a 7? Just one right? Right What about 10 its the same thing so only 1 possibility. So for rolling a 7 its 1/12= unlikely same with 10 so for rolling a 10 its 1/12= unlikely\ which then you do 1/12 +1/12 = 2/12 then if u want to simplify it's 1/6 therefore the answer is 1/6 hope this helped :)