You say, well, how do I calculate this? It's just summing up an infinite number of things. Now, the key realization here is that one way to think about the probability that V is greater than four is this is the same thing as the probability that V is not less than or equal to four. These two things are equivalent. What's the probability that V is not less than or equal to four? This might be a slightly easier thing for you to calculate. Once again, pause the video and see if you can figure it out.