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ICSE Class X Math 2015 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 : 33 of 52
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a green ball.
Solution:  
White5    Red6    Green9\frac{\text{White}}{5} \;\; \frac{\text{Red}}{6} \;\; \frac{\text{Green}}{9}
Total no. of balls =5+6+9=20=5+6+9=20
Probability  =  favourable casesTotal cases\text{Probability} \;=\; \frac{\text{favourable cases}}{\text{Total cases}}
P(Green)  =  920P(\text{Green}) \;=\; \frac{9}{20}
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