Show that if f: A to B and g: B to C are onto, then gof : A to C is also onto.
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/are-f-and-g-both-necessarily-onto-if-gof-is-onto-pls-re/relations-and-functions/4678763
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https://www.meritnation.com/ask-answer/question/are-f-and-g-both-necessarily-onto-if-gof-is-onto-pls-re/relations-and-functions/4678763
Regards