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A bag contains 5 red, 8 green and 7 whit...

A bag contains 5 red, 8 green and 7 white balls. One ball is drawn at random from the bag. Find the probability that the ball drawn is ( 1 ) a white ball or a green ball, ( 2 ) neither a green ball nor a red ball and ( 3 ) not a white ball.

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The correct Answer is:
(1) `3/4`, (2) `7/20`, (3) `13/20`
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