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Suppose that X is an infinite set, and let A be a cofinite subset of X. Prove the following two items: (a) If A

Suppose that X is an infinite set, and let A be a cofinite subset of X. Prove the following two items: (a) If A B X, then B is a cofinite subset of X. (b) If C is a cofinite subset of A, then Cis a cofinite subset of X.

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