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प्रश्न
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.
उत्तर
Total 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
n(E) = 5
Probability of drawing a white ball= `(n(E))/(n(S)) = 5/20 = 1/4`
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