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Set Theorymedium
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For sets A=1,2,ldots,6A = \\{1, 2, \\ldots, 6\\}A=1,2,ldots,6 and B=4,5,ldots,8B = \\{4, 5, \\ldots, 8\\}B=4,5,ldots,8, how many elements are in AoplusBA \\oplus BAoplusB (the symmetric difference)?