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A bag has 4 red marbles, 5 white marbles, and 6 blue marbles. Three marbles are drawn from the bag (without replacement). What is the probability that they are all the same color?

 Mar 28, 2021
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You can compute the probabilities of getting all red, all white, and all blue.  Adding them up, you get 144/455.

 Mar 28, 2021

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