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A bag contains 8 red, 3 white and 9 blue balls. If three balls are drawn at random, determine the probability that (i) all three balls are blue balls (ii) all the balls are of different colours.

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Pobability(all three balls are blue balls)=`.^(9C_3)/.^(20C_3)`
Probability all balls are of different colors=`(.^(9C_1)xx.^(8C_1)xx.^(3C_1))/(.^(20C_3))`
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