These are clearly all yellow. There's two red marbles in the bag, so I could pick that red marble or that red marble. There's two green marbles in the bag, so I could pick that green marble or that green marble. 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.