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[" 76.A bag contains "15" white and some...

[" 76.A bag contains "15" white and some black balls.If the probability of drawing a black ball "[2016]],[" from the bag is thrice that of drawing a white ball,find the number of black balls in "],[" the bag."],[" 77.A game of chance consists of spinning an arrow on a circular board,divided into "8" [2016] "]

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