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An urn contains 6 red, 4 blue, 2 gree...

An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If 4 marbles are picked up at random, what is the probability that at least one of them is blue? `4/(15)` (b) `(69)/(91)` (c) `(11)/(15)` (d) `(22)/(91)` (e) None of these

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