Question: Exercise Let f: A -4 B and g : B -4 C be functions. a) Prove that if g f is injective, then f

Exercise Let f: A -4 B and g : B -4 C

Exercise Let f: A -4 B and g : B -4 C be functions. a) Prove that if g f is injective, then f is injective. b) Prove that if go f is surjective, then g is surjective. c) Find an explicit example where g o f is bijeclive, but neither f nor g is bijective.

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