If $f : \{1, 2, 3\} o \{5, 7, 9\}$ with $1 o 5$, $2 o 7$, $3 o 9$, then $f$ is:

Question

If $f : \{1, 2, 3\} 	o \{5, 7, 9\}$ with $1 	o 5$, $2 	o 7$, $3 	o 9$, then $f$ is:

Accepted Answer

one-one and onto

Answer

only one-one

Answer

only onto

Answer

neither one-one nor onto

If f:{1,2,3}→{5,7,9}f : \{1, 2, 3\} \to \{5, 7, 9\}f:{1,2,3}→{5,7,9} with 1→51 \to 51→5, 2→72 \to 72→7, 3→93 \to 93→9, then fff is: