A bag contains 15 white and some black balls. if the probability of drawing ablack ball from the bag is thrice that of drawing a white ball, find the numberof black balls in the bag.
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White balls - 15
Black balls - n
Probability of drawing a black ball is 3 times.
Means 15x3 - 45 black balls
Black balls - n
Probability of drawing a black ball is 3 times.
Means 15x3 - 45 black balls
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