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JEE Advanced Mathematics question

MathematicsProbabilityJEE Advanced

If one ball is drawn at random from each of the three boxes containing 3 white and 1 black, 2 white and 2 black, 1 white and 3 black balls then the probability that 2 white and 1 black balls will be drawn is

Answer: (A)

Solution

Let be the event that a white ball comes from box . Then , , , and the draws are independent. The black ball can come from

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Question ID VK-109753