So what I want to figure out is, as I start taking a bunch of total moves, it's like my total moves, I mean here I max it out at 170, but you could kind of say, if I started flipping this coin an infinite number of times, I want to figure out what's the probability that my final position is 10 to the right. And what I want to show you is that as you take more and more moves, the normal distribution becomes a better and better approximation for the binomial distribution. So right here, this calculates the binomial probability, just the way we did it before. And you could look at the cell to figure it out. You know, this says 10, you know, I use left moves as a success. So this is 10 choose 0, and we know what that is, it's 10 factorial over 0 factorial over 10 minus 0 factorial, times 0.5 to the 0, times 0.5 to the 10. That's where that number comes from.