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Question: 1 for the following choices of a subset b is...

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1. For the following choices of a subset B, is the set closed under the given operation? (a) B-even integers; operation is multiplication in Z. (b) Bodd integers; operation is addition in Z. (c) B onzero rational numbers; operation is division in the set of nonzero real numbers. (d) B = -(a + b) + 2. odd integers; operation is star where a * b is ab

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