Well, only one of them meets my condition, that right there. So there is a 1 6 probability of rolling a 1. What is the probability of rolling a 1 or a 6? Well, once again, there are 6 equally likely possibilities for what I can get. And there are now 2 possibilities that meet my conditions. I could roll a 1 or I could roll a 6. So now there are 2 possibilities that meet my constraints, my conditions.