So they say the probability, I'll just say P for probability, the probability of picking a yellow marble. And so this is sometimes the event in question right over here, is picking the yellow marble. I'll even write down the word picking. And when you say probability, it's really just a way of measuring the likelihood that something is going to happen. And the way we're going to think about it is how many of the outcomes from this trial, from this picking a marble out of a bag, how many meet our constraints, satisfy this event, and how many possible outcomes are there? So let me write the possible outcomes right over here. So possible outcomes.