And then there's one blue marble in the bag. So this is all the possible outcomes, and sometimes this is referred to as the sample space. Sample, the set of all the possible outcomes. Fancy word for just a simple idea, that the sample space, when I pick something out of the bag and that picking out of the bag is called a trial, there's eight possible things I can do. So when I think about the probability of picking a yellow marble, I want to think about, well, what are all of the possibilities? Well, there's eight possibilities. Eight possibilities for my trial.