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     EduGorilla 
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    There are three similar boxes, containing (i) 6 black & 4 white balls; (ii) 3 black & 7 white balls and (iii) 5 black & 5 white balls, respectively. If you choose one of the three boxes at random and from that particular box pick up a ball at random, and find that to be black, what is the probability that the ball was picked up from the second box?

    Options :-

    1. 3/14

    2. 14/30

    3. 7/30

    4. 7/14

    5. 21/7
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