the four boxes numbered 1,2,3 and 4. Box-1 2000 balls, 5% white Box-2 500 balls, 40% white Box-3 and Box-4 contains 1000 balls, 10% of which is white. from these boxes a ball is chosen at random from a randomly chosen one according to; i) What is the probability that the selected ball is white? ii) What is the probability; If the selected ball is white, this ball must have come from Box-2

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