This is kind of saying just look, whatever you have here, just iterate through it n times. If you had an x sub i here, you would use the first x term and then the second x term. When you have a 1 here, this is just essentially saying add 1 to itself n times, right? Which is the same thing as n. So this is going to be plus mu squared times n. All right. Then let's see if there's anything else we can do here. Remember, this was just the numerator. So this looks fine.