Bonus: In the lower-right corner you will find parts c and d from problem 4.48.
Footnote: The number of aces is a random variable. Here is another:
We studied the problem of drawing 3 cards from a 5 card deck.
We concluded that there are 120 possible orderings of 5 cards. There are 10 possible hands that are equally likely, and each can result from 12 orderings.