a bag contains 6 red balls and some blue balls. if the probability of drawing a blue ball from the bag is twice that of a red ball , find the number of blue balls

Given Red balls = 6

Let Blue balls = B

Total balls = B + 6

P(E)of blue balls is double than red balls

then

P(E) blue = 2 x P(E) red

B / B + 6 = 2 x 6 / B + 6

B = 12

Therefore ther are 12 blue balls

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