I am trying to prove the following by the given:
- $g \circ f$ Surjective
- $f:A\rightarrow B$
- $g:B\rightarrow C$
1) Assuming that $g$ is Injective I want to prove the $f$ is Surjective.
2) there is option to say that $f$ is surjective without the assumption that $g$ is Injective?
Any suggestions? Thanks!