A box contains 1 white ball, 3 red balls and 2 black balls. Another box contains 2 white ball, 3 red balls and 4 black balls. A third box contains 3 white ball, 4 red balls and 5 black balls. If 2 balls are drawn(without replacement) from randomly selected box and one of the ball is white and the other ball is red, the probability that these 2 balls are drawn from is (iitjeeadvanced, 2013)
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It is 2 out of these many because out of these many balls only two are drawn
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