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in Class XII Maths by (-2,838 points)
An urn contains m white and n black balls. A ball is drawn at random and is put back into the um along with k 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.

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Let Event, E1 = First ball drawn of white colour
Event, E2 = First ball drawn of black colour
and Event,E = Second ball drawn of white colour     

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