Let $A = B = \{ 1,2,3 \}$, and consider the function $f : A \rightarrow B$ defined as follows: $f ( 1 ) = 3$, $f ( 2 ) = 1 , f ( 3 ) = 3$. Is $f$ onto? Why or why not?

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The Answer of Let $A = B = \{ 1,2,3 \}$, and consider the function $f : A \rightarrow B$ defined as follows: $f ( 1 ) = 3$, $f ( 2 ) = 1 , f ( 3 ) = 3$. Is $f$ onto? Why or why not?

Let A=B={1,2,3}A = B = \{ 1,2,3 \}A=B={1,2,3} , and Consider the Function

Let $A = B = \{ 1,2,3 \}$ , and Consider the Function