A company has 6 officers and 4 directors (10 different people). In how many ways can a committee of 4 be selected from these 10 people so that the following hold? (a) 2 members are officers and 2 are directors. ways (b) 3 members are officers and 1 is a director. ways (c) All the members are officers. ways (d) There are no restrictions. ways.

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