Question

# A bag contains 3 red, 4 white and 5 blue balls (All balls are different). If two balls are drawn at random, then the probability that they are of different colours is:47661033522None

Solution

## The correct option is A 4766We have the following pattern: Ired,whitePI=3×412C2IIred,bluePII=3×512C2IIIblue,whitePIII=4×512C2 Since all these cases are exclusive, so the required probability =(12+15+20)12C2=4766

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