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A bag contains three red, seven black, and five green marbles.Four marbles are selected at random without replacement. a)What is the probability that all four

A bag contains three red, seven black, and five green marbles.Four marbles are selected at random without replacement.

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

b)Find the probability that no more than 2 green marbles are chosen.

c)What is the probability that exactly 2 marbles are green and none are red?

d)What is the expected number of red, black, and green marbles?

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