Let A , B , and C be subsets of real numbers. Let f : A → B and g: B → C be two functions such that gof is onto. the which of the following is true
Answer & explanation
Correct answer: option 3
$g(f(x))$ → onto ⇒ for every $g(f(x))$
there exists atleast one $f(x)$
but $f(x)$ ⇒ there exist atleast one $x$ so $f(x)$ is not necessarily onto