Respuesta :
[tex]\\ \bull\tt\dashrightarrow f=\left\{(1,3),(2,5),(3,7),(4,9)\right\}[/tex]
Now
- Just flip
[tex]\\ \bull\tt\dashrightarrow f^{-1}=\left\{(3,1),(5,2),(7,3),(9,4)\right\}[/tex]
[tex]\\ \bull\tt\dashrightarrow f=\left\{(1,3),(2,5),(3,7),(4,9)\right\}[/tex]
Now
[tex]\\ \bull\tt\dashrightarrow f^{-1}=\left\{(3,1),(5,2),(7,3),(9,4)\right\}[/tex]