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)


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

x = 45

Hence, No of black balls is 45.

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