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OpenStudy (anonymous):
Which set is closed under the operation multiplication? A. {1, 2} B. {1, 2, 3} C. {1} D. {0, 1, 2}
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OpenStudy (amistre64):
since closed means that for any operation we end up in the same set ... which one of these sets, when multiplication is used ... has answers that are in the same set?
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