A bag contains 3 red, 4 green and 3 yellow balls. if 2 balls are drawn at random, what is the probability that they are of different color?
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probability = 3c1×4c1/15c2 + 4c1×3c1/15c2 + 3c1×3c1/15c2
12/105 + 12/105 + 9/105
33/105
11/35 is answer
12/105 + 12/105 + 9/105
33/105
11/35 is answer
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