Ononot — Let A = \{1, 2\} and B = \{2, \{3\}\}. Find the cardinality

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Set Theorymedium

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Let $A = \{1, 2\}$ and $B = \{2, \{3\}\}$ . Find the cardinality of the power set of $A \cup B$ , denoted by $n(\mathcal{P}(A \cup B))$ .