Question: 40. A ball is drawn from an urn containing 3 white and 3 black balls. After the ball is drawn, it is replaced and another

40. A ball is drawn from an urn containing 3 white and 3 black balls. After the ball is drawn, it is replaced and another ball is drawn. This process goes on indefinitely. What is the probability that of the first 4 balls drawn, exactly 2 are white

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