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:
red or white
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Solution
Total number of balls in the box=48
Total possible outcomes on drawing g ball=48
n(s)=48
red or a white ball =12+16=28 balls
Event of drrawing a red or white ball=E=28
n(E)=28
Probability of not drawing a green ball= `(n(E))/(n(s))=28/488=7/12`
Concept: Type of Event - Complementry
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