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If $f: A \rightarrow B, g: B \rightarrow C$ are functions such that $g \circ f: A \rightarrow C$ is onto, then a necessary condition is
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The correct answer is:
g is onto
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. Hence, option (b) is correct.
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