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11. Suppose you have a box containing 20 colored marbles. Four of these marbles are blue. You draw one marble at random from the box

11. Suppose you have a box containing 20 colored marbles. Four of these marbles are blue. You draw one marble at random from the box and discover it is blue. If you do not place this marble back into the box, what is the probability that you pull out another blue marble on your second draw from box?

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