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Mathematics 5 Online
OpenStudy (anonymous):

What is the theoretical probability of being dealt exactly two 2's in a 5-card hand from a standard 52-card deck?

OpenStudy (anonymous):

Can someone explain how to solve this?

OpenStudy (anonymous):

two "2" and 3 "not 2" you can use \[\frac{\binom{4}{2}\binom{48}{3}}{\binom{52}{5}}\]

OpenStudy (anonymous):

that is, the number of ways you can choose 2 out of the 4 twos time the number of ways to choose 3 out of the 48 other cards, divided by the total number of ways you can choose 5 out of the 52 cards

OpenStudy (anonymous):

I'm sorry but I still don't understand...

OpenStudy (anonymous):

do you know what i meant by \(\binom{48}{3}\)? you may have seen this written instead as \(_{48}C_3\)

OpenStudy (anonymous):

ah! Yeah, I know what that is! haha now that makes sense.

OpenStudy (anonymous):

good

OpenStudy (anonymous):

If it's two of 2's where did 4C2 come from? Shouldn't it be 2C2?

OpenStudy (anonymous):

there are 4 "2's" in the deck, you want to choose two of them

OpenStudy (anonymous):

ah ok

OpenStudy (anonymous):

So is the answer 2162/54145?

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