A box contains 7 red balls, 8 green balls and 5 white balls. A ball is drawn at random from the box. Find the probability that the ball is:
white
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Solution
Ttotal number of balls in the box =7+8+5=20 balls
Total possible outcomes=20=n(s)
Event of drawing a white ball=E= number of white balls
Probability of drawing a white ball= `(n(E))/(n(s))=5/20=1/4`
Concept: Type of Event - Complementry
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