Question: Consider the principle N { A B } = N { A } + N { B } N { A B }. Alekzio, a

Consider the principleN{AB} =N{A} +N{B}N{AB}.

Alekzio, a librarian at the city library, is reshelving books. He replaces46mysteries and67romance novels; of these,24werecross-listedas both mystery and romance. How many books did Alekzio reshelve in all?

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