Colored balls in boxes

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There are three boxes, one containing two black balls, another containing two white balls, and another containing one black and one white ball.  You select a random ball from a random box and you find you selected a white ball.  What is the probability that the other ball in the same box is also white?

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    ((1/3)*1) / ( ((1/3)*0) + ((1/3)*1) + ((1/3)*(1/2)) ) =  2/3

    devareddykarthik Guru Answered on 13th April 2016.
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