Jawaban B.13.1.

\(f(A)=\{a,b\}\text{,}\) \(f^{-1}(B)=\{1,2\}\text{,}\) \(f^{-1}(f(A))=\{1,2,3\}\text{,}\) dan \(f(f^{-1}(B))=\{a\}\text{.}\)
in-context