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ISRO 2013 Probability [EE]

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ANS)B

We can either draw two black or two white.

Total favorable combinations are,

    drawing two black balls=5c2, the probability that the ball is black=5c2/10c2

    drawing two white balls=5c2, the probability that the ball is black=5c2/10c2

Probability that we draw balls of the same color by sum rule of probability is=2*5c2/10c2=20/45=4/9

    

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