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A bag contains 15 white and some black b...

A bag contains 15 white and some black balls. If the probability of drawing a black ball from the bag is thrice that of drawing a white ball, find the number of black balls in the bag.

Text Solution

Verified by Experts

The correct Answer is:
`(x)/(15+x)=3xx(15)/(15+x),x=45`
No. of black balls = 45
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