How many of these outcomes are essentially described by our event? Well, we see them right here. Doubles, well, that's rolling a 1 and a 1. It's a 2 and a 2, a 3 and a 3, a 4 and a 4, a 5 and a 5, and a 6 and a 6. So we have 1, 2, 3, 4, 5, 6 events satisfy this event or are the outcomes that are consistent with this event. Now, given that, let's answer our question. What is the probability of rolling doubles on two six-sided die numbered from 1 to 6?