ICSE Class X Math 2015 Solved Paper

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A bag contains 5 white balls, 6 red balls and 9 green balls. A ball is drawn at random from the bag. Find the probability that the ball drawn is :
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Question : 35
Total: 52
is neither a green ball nor a white ball.
Solution:  
P (neigher green nor white) =P( Red )
=
6
20
=
3
10
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