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A bag contains 8 identically sized balls, 6 black and 2 white. Balls are drawn out one at a time, at random without replacement. The

A bag contains 8 identically sized balls, 6 black and 2 white. Balls are drawn out one at a time, at random without replacement. The Wth draw is when a white ball is first drawn.

a)If each drawn ball is now replaced before another is drawn, show that []=4.

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