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. So let me erase this a little bit, do a few more terms. This is going to be the probability that X equals two, sorry, the probability that X equals three, times three. And we're going to keep going on and on and on.