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probability problem

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A box contains 6 green, 8 red, 5 yellow, and 10 blue marbles. Four marbles are drawn from the box at the same time.

a) What is the probability that all four marbles are the same color?

b) What is the probability that none of the marbles is blue?

c) What is the probability that you get one marble of each color?

d) What is the probability that you draw more than 2 green marbles?

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