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Rahul has a bag which contains 4 white, ...

Rahul has a bag which contains `4` white, `5` black and `6` red balls. `3` balls are drawn randomly by Shobhit. Then what is the probability that the balls drawn are ot different colours? (A) `13/91` (B) `18/91` (C) `21/91` (D) `24/91`

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