Question

f : X −→ Y , g : Y −→ Z be two functions.

(a) gof is injective =⇒ f, g are injective

(b) gof is surjective =⇒ f, g are both surjective

(c) gof is bijective =⇒ f, g are both bijective​

Answer 1

Answer:

gof is surjective =⇒ f, g are both surjective