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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Mar 2008 21:46:46 IST
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I posted this question some time before...but i m again facing problem in it....
An urn contains m different red and n different black balls .The are drawn one at a time until only those of same colour are left.Then the probability that these are all red is?
ans- m/(m+n)
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