This is essentially 36 choose 9. This expression right here is the same thing, just so you can relate it to the, I guess, combinatorics formulas that you might be familiar with. This is the same thing as 36 factorial over 36 minus 9 factorial, that's what this orange part is over here, divided by 9 factorial, or over 9 factorial. What's green is what's green, and what is orange is what's orange there. So that's the total number of hands. Now, a little bit more of a nuanced thought process is, how do we figure out the number of ways in which the event can happen, in which we can have all four 1's? So let's figure that out.