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Set Theorymedium
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For sets A=1,2,ldots,7A = \\{1, 2, \\ldots, 7\\}A=1,2,ldots,7 and B=5,6,ldots,9B = \\{5, 6, \\ldots, 9\\}B=5,6,ldots,9, how many elements are in AoplusBA \\oplus BAoplusB (the symmetric difference)?