# A group of ten seniors, eight juniors, five sophomores, and five freshmen must select a committee of four?

How many committees are possible if the committee must consist of the following?

Help Please!

Help Please!

Update:
sorry about that,

Second part,

(a) one person from each class

(b) any mixture of the classes

20475

(c) exactly two seniors

I found (b) already

Second part,

(a) one person from each class

(b) any mixture of the classes

20475

(c) exactly two seniors

I found (b) already

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