An urn contains m white and n black balls.


An urn contains white and black balls. A ball is drawn at random and is put back into the urn along with additional balls of the same colour as that of the ball drawn. A ball is again drawn at random. Show that the probability of drawing a white ball now does not depend on k.


Let’s consider A to be the event of having m white and n black balls

E1 = First ball drawn of white colour

E2 = First ball drawn of black colour

E= Second ball drawn of white colour

Therefore, the probability if drawing a white ball does not depend upon k.

Leave a comment


Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now