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[" contains some white and some black balls,all combinations of balls being equally likely.The "],[" mber of balls in the bag is "10." If three balls are drawn at random without replacement and all "],[" tare found to be black,the probability that the bag contains "1" white and "9" black balls is "],[[" (B) "(12)/(55)," (C) "(2)/(11)," (D) "(8)/(55)]]

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