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There is an urn having r red balls, b blue balls and w white balls. There is atleast two balls are there of each color. We are taking two balls from the urn without replacement. What is the probability that the second ball selected is red. Express in terms of r, b and w

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P (RR) + P(!R R)

= r/(r+b+w) * (r-1)/(r+b+w-1)

+ (b+ w)/ (r+b+w) * r/(r+b+w-1)
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