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Need help with this question A committee of four is selected from a total of 4 freshmen, 5 sophomores, and 6 juniors. Find the probabilities

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A committee of four is selected from a total of 4 freshmen, 5 sophomores, and 6 juniors. Find the probabilities for the following events.

a. At least three freshmen.

b. All four of the same class.

c. Not all four from the same class.

d. Exactly three of the same class.

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