... one-to-one?d) Is the function onto?11. Let f : A → B and g : B → C be functions. Prove each of the following:a) If f and g are one-to-one, then g ◦ f is one-to-one.b) If g ◦ f is one-to-one, ... one-to-one.c) If f is onto and g ◦ f is one-to-one, then g is one-to-one.d) If f and g are onto, then g ◦ f is onto.e) If g ◦ f is onto, then g is onto.f) If g ◦ f is onto and g is one-to-one, ... representations (3), when p j is not a prime factorof a (resp. b), then the corresponding exponent u j (resp. v j ) is zero. Now writed =r j= 1pmin{u j ,v j } j . (4)Clearly d | a and d...