Question: How many 4-person committees are possible from a group of 9 people if (A) There are no restrictions? (B) Both Jim and Mary must be

How many 4-person committees are possible from a group of 9 people if
(A) There are no restrictions?
(B) Both Jim and Mary must be on the committee?
(C) Either Jim or Mary (but not both) must be on the committee?

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