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A bag contains  white balls and  black balls. Two balls are drawn in succession. The probability that one of them is black and the other is white is:
  • a)
    2/3
  • b)
    4/5
  • c)
    1/2
  • d)
    1/3
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A bag contains white balls and black balls. Two balls are drawn in suc...
probability of first ball white and second one black = (10/25)x(15/24)
probability of first ball black and second one white = (15/25)x(10/24)
probabilty = sum of above two probabilities = 1/2
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