Which of these is equivalent to this sum right over here? Well, like we did before, let's just expand it out. And what's different here is that we just have a variable, but that shouldn't make it too much more difficult. So let's do the situation, and I'll write it out. Let's do the situation when n is equal to one. When n is equal to one, it's gonna be k over one plus one. K over one plus one, and I'll write it out.