An urn contains 2 red, 3 green and 2 ...

An urn contains 2 red, 3 green and 2 blue balls. If 2 balls are drawn at random, find the probability that no ball is blue? `5/7` (b) `(10)/(21)` (c) `2/7` (d) `(11)/(21)` (e) None of these

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