Question

a bag contains white black and red balls only a ball is drawn at the random from the bag the possibility of getting a white ball is 3 by 10 and that of a black ball is 2 by 5 find the probability of getting a red ball if the bag contains 20 black balls then find the total number of the balls in the bag

Answer 1

P(E) white ball = 3\10

P(E) black ball = 2\5--------------------(1)

Black balls = 20

∴ From 1

2\5=2*10\5*10=20/50

∴There are 50 balls in total

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