A box contains 500 balls of the same shape and weight. Ajay finds that, among the balls 160 balls are white, 200 are red and rest are black. What is the probability that a ball drawn at random from the box is not black?
option
18/25
360/400
140/500
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. 18/25 is the right answer
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Given,
Total balls = 500
Total white balls = 160
Total red balls = 200
To Find.
The probability that a ball is drawn at random from the box is not black=?
Solution,
Total black balls = Total - red balls - white balls
Total black balls = 500 - 200 - 160
Total black balls = 140
Probability of getting a black ball = 140 / 500
Probability of not getting a black ball = 1 - Probability of getting a black ball
Probability of not getting a black ball = 1 - 140 / 500
Probability of not getting a black ball = (500 - 140) / 500
Probability of not getting a black ball = 360 / 500 = 18 / 25
Hence, The probability that a ball is drawn at random from the box is not black is 360 / 500 or 18/25.
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