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JEE Main 2012 Mathematics question

MathematicsProbabilityJEE Main 2012

There are two balls in an urn. Each ball can be either white or black. If a white ball is put into the urn and there after a ball is drawn at random from the urn, then the probability that it is white is

Answer: (2)

Solution

Each original ball is white or black with probability ½, so the urn has 0, 1, 2 whites with probabilities ¼, ½, ¼. After adding

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Question ID VK-103714