Ononot — If A = \{1, 2, 3\} and B = \{3, 4, 5\}, what is n(A \cup B)

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Set Theoryhard

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If $A = \{1, 2, 3\}$ and $B = \{3, 4, 5\}$ , what is $n(A \cup B) + n(A \cap B)$ ?