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3. Mark each of the following statements as True or False. If True, give a proof. If False, provide a counterexample. Assume that the statements

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3. Mark each of the following statements as True or False. If True, give a proof. If False, provide a counterexample. Assume that the statements apply to all sets (a) A-(B-C)=(A-B)-C (b) (A-C)-(B-C)=A-B

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