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Upgrading a Poker Hand

If you are playing a game of Five Card-Draw with a friend out of a standard deck 52 card deck and you have the following hand (neglecting suits for this example) 3,3,3,5,7. You decide to discard the "5" and draw from the deck. What is the probability that you upgrade to Four of a Kind ( 3,3,3,3,7)?

I'm having a bit of trouble wrapping my head around the following... Does the fact that your opponent has 5 of the 47 remaining out of the draw deck ( leaving 42 in the deck from which you can choose) effect the probability of you drawing the remaining "3" or not?

I may be perpetually inept in probability, but I do "enjoy" the frustration.

Thanks, Eric

Note by Eric Roberts
2 weeks, 1 day ago

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