A standard deck of 52 cards is randomly shuffled. Bob keeps drawing from the deck until he has drawn two 8s.
What is the probability that, when, he draws the second 8, he has already drawn exactly two 2s?
I think this could be a combinations problem because the order of the drawing two 2s does not matter. However, I am not sure how to account for the fact that he could draw an 8 or a second 8 at any point.