Q. 144.4( 18 Votes )

A bag contains 15

Answer :

Let the no of black balls be 'x'


No of white balls = 15


Total no of balls = 15 + x


Now, we know that


Probability of an event


P(getting a white ball)


P(getting a black ball)


Given,


P(getting a black ball) = 3 × P(getting a white ball)



x = 45


Hence, No of black balls is 45.


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