A = all whole numbers except 12 B = all whole numbers except 17 C= {5, 6, 7, 8, 9, ..} %3D a. Is A closed under addition? (If not, prove it.) b. Is A closed under multiplication? (If not, prove it.) c. Is B closed under multiplication? (If not, prove it.) d. Is C closed under multiplication? (If not, prove it.)

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