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STIS: Math Probability Question

Posted by Strongbad (aka Rambler14) May 23 '12, 14:38

What is the probability that if you deal 5 cards off the top of a deck of 52, at least 3 are spades?

Responses:

Thanks everyone. -- nm - Strongbad May 23, 14:51
Slim -- nm - peglegpete May 23, 14:48
[deleted] 6
- heh, I would have guessed 10.5%. -- nm - Spawn May 23, 16:03
- [deleted] 4
  - Graci. I think I had the idea down but missed a digit somewhere. -- nm - Strongbad May 23, 14:51
  - except that calculation puts the cards back in the deck. -- nm - Reagen May 23, 14:49 1
    - [deleted]
  - [deleted]
I think it's ... - Beryllium May 23, 14:42 3
- that's the probability of drawing three spades as the first three cards. - Reagen May 23, 14:43
- Wouldn't that be - Strongbad May 23, 14:43
- wait, no, that's the odds of the first three being spades -- nm - Beryllium May 23, 14:42
My answer, hoping for someone to confirm - Strongbad May 23, 14:38 10
- And here's the math behind my answer - Strongbad May 23, 14:44 7
  - Hmmm... small correction - Roger More May 23, 14:50 4
    - Hang on, never mind, I multiplied by the wrong cell in Excel. (I'm still not smart enough to do the permutations either) -- nm - Roger More May 23, 14:52
    - (I'm not smart enough to figure how to do it with the permutations though) -- nm - Roger More May 23, 14:51 2
      - [deleted] 1
        
        Because 4th grade and fractions are a long time ago, and I forgot about how to work with denominators. -- nm - Roger More May 23, 15:07
  - You've got to include the permutations. - Reagen May 23, 14:48
  - maybe you're missing the ordering ... dunno -- nm - Beryllium May 23, 14:47
- Hmmm... by my calc, the odds of dealing 3 spades with three cards is about 1.3%. - Roger More May 23, 14:42 1
  - I think you're right and I'm wrong, but I can't figure out why I'm wrong. -- nm - Strongbad May 23, 14:43

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STIS: Math Probability Question

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