Probability of drawing red and black balls

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Urn 1 contains 5 red balls and 3 black balls.  Urn 2 contains 3 red balls and 1 black ball.  Urn 3 contains 4 red balls and 2 black balls.  If an urn is selected at random and a ball is drawn, find the probability it will be red.

Reference no: EM1318048

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