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A bag contains some white and some black balls, all combinations of balls being equally likely. The total number of balls in the bag

A bag contains some white and some black balls, all combinations of balls being equally likely. The total number of balls in the bag is 10. If three balls are drawn at random without replacement and all of them are found to be black, the probability that the bag contains 1 white and 9 black balls is 14 (A) 55 12 (B) 55 2 (C) 11

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