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  4. If f: A arrow B, g: B arrow C are functions such that gof: A arrow C is onto, then a necessary condition is

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Q. If $f: A \rightarrow B, g: B \rightarrow C$ are functions such that gof $: A \rightarrow C$ is onto, then a necessary condition is

AP EAMCETAP EAMCET 2019

Solution:

If functions $f: A \rightarrow B$ and $g: B \rightarrow C$, such that gof $: A \rightarrow C$ is onto, then it is necessary that ' $g$ ' is onto.