What is the probability of rolling doubles on two six-sided die numbered from 1 to 6? Well, the probability is going to be equal to the number of outcomes that satisfy our criteria, or the number of outcomes for this event, which are 6. We just figured that out. Over the total number of outcomes, over the size of our sample space. So this right over here, we have 36 total outcomes. So we have 36 outcomes. And if you simplify this, 6 over 36 is the same thing as 1, 6.