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प्रश्न
A bag contains 15 balls, out of which some are white and the others are black. If the probability of drawing a black ball at random from the bag is `2/3`, then find how many white balls are there in the bag.
उत्तर
Total number of balls 15
Probability of drawing a black ball at random is `2/3`
probability of black ball + probability of white ball = 1
Probability of white ball = 1- probability of black ball
Probability of drawing a white ball = `1 - 2/3 = 1/3`
Therefore, the number of white balls = `15 xx 1/3 = 5`
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