Question: Let f : A B and g : B C be functions. Find a counterexample to disprove the following statement: If g is onto, then

Let f:AB and g:BC be functions. Find a counterexample to disprove the following statement:
If g is onto, then g@f is also onto.
Here, a "counterexample" refers to specific values of A,B,C,f, and g.
Let f:AB and g:BC be functions. Find a counterexample to disprove

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