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Mathematics 21 Online
OpenStudy (anonymous):

If A = {1, 2, 3, 4, 5} and B = {3, 6, 9, 12, 15}, what is A B? {1, 2, 3, 4, 5, 6, 9, 12, 15} {3} {1, 2, 3, 3, 4, 5, 6, 9, 12, 15} { }

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