In draw poker, you will initially deal out, say eight hands of five cards each (40 in total), leaving 12 "unseen" cards. Some players will fold, others will choose to draw.
In "The Education of a Poker Player" Herbert O. Yardley (1889-1958) supposed that four players would fold (20 cards total), and the remaining four stay, and draw a total of eight cards.
Where do these eight cards come from? Is it from the 12 "unseen" cards in the original deck? Do you mix in the 20 "folded" cards before dealing from the deck? And how about the eight "exchanged" cards by people who are still playing?
Suppose 5-6 people "stay" and draw 13-14 cards (that is more than the 12 unseen cards). Does that change the answer?