A bag contains 40 balls out of which some are red, some are blue and remaining are black. If the probability of drawing a red ball is 11/20 and that of blue ball is 1/5 , then find the number of black balls.
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10/40 is a answer
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well I think You Must Be In 10th Standard . As Even I am In 10th So I now This Is From Probability. Am I Right?
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