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A five-member committee is to be formed from 6 class A, 5 class B, and 4 clas C students. In how many ways can this be done if:
a.) there are no restrictions on membership?
b.) there will be 3 class A, 1 class B, and 1 class C student in the committee?
c.) there will be at least one class A student in the committee?
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