That is 487,635 combinations. If you're picking four numbers, you're choosing four numbers out of 60 or 60 choose 4. Now, the question they say is, what is the probability that the winning numbers are 3, 15, 46, and 49? Well, this is just one particular of the combinations. This is just one of the 487,635 possible outcomes. So the probability of 3, 15, 46, 49 winning is just equal to, well, this is just one of the outcomes out of 487,635. So that right there is your probability of winning.