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A company has 7 senior and 5 junior officers. It wants to form a committee. In how many ways can a 4- officers committee be

A company has 7 senior and 5 junior officers. It wants to form a committee. In how many ways can a 4- officers committee be formed so that it is composed of

Any 4 officers?

3 senior officers and 1 junior officers?

At least 2 senior officers?

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