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An urn contains 6 balls of which two are red and four are black. Two balls are drawn at random.

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An urn contains 6 balls of which two are red and four are black. Two balls are drawn at random. Probability that they are of the different colours is 

(a) 2/5

(b) 1/15

(c) 8/15

(d) 4/15

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Correct option is (C) 8/15

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