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A bag contains 5 red balls …

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A bag contains 5 red balls and some blue balls . If the probability of drawing a blue ball is thrice that of the red ball, find the number of blue balls
  • 1 answers

Indira Ramesh 2 weeks ago

Let the number of blue balls be =x

P(red ball)=5/x+5

P(blue ball)=x/x+5

Given condition P(blue ball)=3×P(red ball)

x/x+5=3×5/x+5

x=15

Number of blue balls=15

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