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For items 1 - 2. Let A = {2,3,4,7), B = { 2, 4, 5, 6} 1. Find A UB. A. { 2, 3, 4, 5, 6} B. { 2, 3, 4, 5, 6, 7} C. {2, 4, 6} D. { 1, 3, 5)​