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From: Nmacgre on 4 Aug 2010 09:21
Hello:

There is a bucket of 20 golfballs, 4 of which are defecive. If you
select two at random, what is the probability that they are both
defective?

I get 3/95. This right? Also why does the binomial distribution not
work here?

C(20,2)*(4/20)^2*(16/20)^2
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