Ononot — Let A = \{1,2,3,4,5\} and B = \{3,4,5,6,7\}. Find |A \triang

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Set Theorymedium

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Let $A = \{1,2,3,4,5\}$ and $B = \{3,4,5,6,7\}$ . Find $|A \triangle B|$ (the size of the symmetric difference).