And it's also finite. It can only take on x equals zero, x equals one, x equals two, x equals three, x equals four, or x equals five. And you see when you plot its probability distribution, this discrete probability distribution, you have it, you know, it starts at one 30 second, it goes up, and then it comes back down. And it has this symmetry. And a distribution like this, this right over here, a discrete distribution like this, we call this a binomial distribution. And we'll talk in the future about why it's called a binomial distribution. But a big clue, actually I'll tell you why it's called a binomial distribution, is that these probabilities, you can get them using binomial coefficients, using combinatorics.