A bag has 4 red balls and 5 black balls , a second bag has 3 red and 7 black balls .One ball is drawn from the first bag and two front second bag .Find the probability that out of three balls, two are black and one is red
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no. of black balls 12(7+5) no. of red balls =7 (4+3) probability=6/19 of black balls and 7/19 of red balls
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