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Set Theorymedium
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For sets A=1,2,ldots,22A = \\{1, 2, \\ldots, 22\\}A=1,2,ldots,22 and B=20,21,ldots,24B = \\{20, 21, \\ldots, 24\\}B=20,21,ldots,24, how many elements are in AoplusBA \\oplus BAoplusB (the symmetric difference)?