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Marceline has a bag which contains 5 orange marbles and 4 white marbles. She draws marbles one at a time without replacement until she draws

Marceline has a bag which contains 5 orange marbles and 4 white marbles. She draws marbles one at a time without replacement until she draws a orange at which point she stops. Let be the random variable which counts the number of white marbles that have been drawn when she stops. Compute [2]

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