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A bag contains 5 red, 8 white and 7 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is

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A bag contains 5 red, 8 white and 7 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is:

(i) red or white. (ii) not black. (iii) neither white nor black.

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Total number of balls = 5 + 8 + 7 = 20

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