A ball is drawn at random from a box containing 12 white, 16 red and 20 green balls. Determine the probability that the ball drawn is:
not green
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Solution
Total number of balls in the box=48
Total possible outcomes on drawing a ball=48
n(s)=48
Event of drawing a green ball=E=2
n(E)=20
Probability of drawing a green ball =`(n(E))/(n(s))=20/48=5/12`
Probability of not drawing a green ball =`1-5/12 =(12-5)/12=7/12`
Concept: Type of Event - Complementry
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