Ononot — Let A = \{1, 2, 3\}. Let X be the set of all subsets of A th

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Set Theorymedium

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Let $A = \{1, 2, 3\}$ . Let $X$ be the set of all subsets of $A$ that contain $1$ , and let $Y$ be the set of all subsets of $A$ that contain $2$ . Find the cardinality of the symmetric difference $X \Delta Y$ .