Just like the binomial distribution is and the Poisson distribution is, based on a bunch of parameters. But it's equal to, and this is how you would traditionally see it written in a lot of textbooks. And if we have time, I'd like to rearrange the algebra, just so you get a little bit more intuition of how it all works out. Or maybe we could get some insights on where it all came from. I'm not going to prove it in this video. That's a little bit beyond our scope. Although I do want to do it.