A box contains 4 black balls, 3 red balls and 5 green balls. 2 balls are drawn from the box at random. What is the probability that both the balls are of the same colour?
(a) 47/68
(b) 1/6
(c) 19/66
(d) 2/11
(e) None of these
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rhe probability of getting the ball of same colour is 2/12 that is 1/6(b).
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