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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

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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 no. of balls=20.
Probability(Ball is red or white)=`13/20`
Probability(ball is not black)`=13/20`
Probability(neither white nor black)=`1/4`
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