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A high school club consists of 4 freshmen, 5 sophomores, 5 juniors, and 6 seniors. How...

A high school club consists of 4 freshmen, 5 sophomores, 5 juniors, and 6 seniors. How many ways a commitee of 4 people be chosen that includes:
a. One student from each class?
b. All juniors?
c. Two freshmen, and 2 seniors?
d. No freshmen?
e. At least three seniors?
Math   Algebra   
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