Well, this right over here is zero factorial, which is equal to one, and so this whole thing simplifies to one. So this is going to be one out of 130 seconds. And so you see the symmetry, 130 second, 130 seconds, 532nd, 532nd, 1032nd, 1032nd. And that makes sense, because the probability of getting five heads is the same as the probability of getting zero tails. And the probability of getting zero tails should be the same as the probability of getting zero heads. So I'll leave you there for this video. In the next video, we'll kind of graphically represent this and we'll see the probability distribution for this random variable.