If I distribute this negative, this could be plus and then this would be P minus one. And then if we distribute this expected value of X, we get on the left hand side, let me scroll up a little bit, I don't want to squinch it too much. So let's see, we have the expected value of X and then plus P times the expected value of X, P times the expected value of X minus the expected value of X. These cancel out. It's going to be equal to P plus P times one minus P plus P times one minus P squared. And it's going to keep going on and on and on. Well on the left hand side, all I have is a P times the expected value of X.