So if p1 is equal to p2, we can just represent them as just some true population proportion. So we could say that this is going to be equal to, so we could write it like this. The square root of, we can literally just factor out, 1 over 1,000 times p times 1 minus p plus p times 1 minus p, because they're going to be the same value. That's what we're assuming in the null hypothesis. And so this is just 2 of these over here. So this is going to be equal to 2p times 1 minus p, all of that over 1,000. And we're going to take the square root of that.