1
Question
There are three similar boxes, containing:
(i) 5 black and 5 white balls
(ii) 3 black and 7 white balls
(iii) 6 black and 4 white balls, respectively.
Sarosh chooses one of the three boxes at random and from that particular box, he picks up a ball at random and finds that the ball is black.
What is the probability that the ball is picked up from the second box?
There are three similar boxes, containing:
(i) 5 black and 5 white balls
(ii) 3 black and 7 white balls
(iii) 6 black and 4 white balls, respectively.
Sarosh chooses one of the three boxes at random and from that particular box, he picks up a ball at random and finds that the ball is black.
What is the probability that the ball is picked up from the second box?
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Solution
The correct option is D 3/14
Total number of black balls = 6+3+5 = 14
Total number of ways of picking black ball = 14
Out of those, 3 are from the 2nd box.
Required probability = 314
3/14
Total number of black balls = 6+3+5 = 14
Total number of ways of picking black ball = 14
Out of those, 3 are from the 2nd box.
Required probability = 314
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