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While looking through all of the probability-related

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Manager
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While looking through all of the probability-related [#permalink] New post 05 Dec 2003, 10:59
While looking through all of the probability-related postings here, I came across a lot of references to hypergeometric distribution. Can any of the experts here please summarize the scope of hyp. distribution that is covered in the GMAT?


Thanks.
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Re: Hypergeometric distribution [#permalink] New post 05 Dec 2003, 11:23
bluefox420 wrote:
While looking through all of the probability-related postings here, I came across a lot of references to hypergeometric distribution. Can any of the experts here please summarize the scope of hyp. distribution that is covered in the GMAT?


Thanks.



not much . just the basic formula.
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 [#permalink] New post 05 Dec 2003, 11:38
Most questions I have seen are of this type:

There are 3 red balls, 4 green balls and 5 yellow balls.
If 4 balls are selected, what is the probability of selecting exactly 2 yellow balls?

numerator is 5C2 x 7C2
denominator is 12C4

prob is (5C2 x 7C2) / 12C4

Is this a correct application of the formula? Please advise.
  [#permalink] 05 Dec 2003, 11:38
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