But what is this going to be equal to? Well this is going to be equal to, what's the probability that we have a success on our first trial? And actually let me just write it over here. So this is going to be P. What is this going to be? What is the probability that we don't have a success on our first trial but we have one on our second trial? Well this is going to be one minus P, that's the first trial where we don't have a success, times a success on the second trial. And actually let me do a few more terms here.