# A bag contains 3

As there are 3 +4+5 = 12 balls.

So, 2 balls out of 12 can be drawn in 12C2 ways = 66

Let E denote the event that balls drawn are of different colours

Either the balls will be red-white or white-blue or red-blue.

P(E) =

Hence,

P(E) = 47/66

As our answer matches only with option (a)

Option (a) is the only correct choice.

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