Mad F.

asked • 01/13/21

Find Probability of X=3

A bag had 1 red ball, 1 blue ball, and 12 green balls. Balls are taken out of the bag at random, one after the other and without replacement until a green ball is picked, at which point no more balls are picked. The random variable X represents the total number of balls taken out of the bag.

Find Pr(X=3)

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