Ononot — For sets A = \\{1, 2, \\ldots, 7\\} and B = \\{5, 6, \\ldots

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Set Theorymedium

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