A bag contains 5 red balls …
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Indira Ramesh 6 months, 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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