The answers to exercise marked [BB] can he found in the Back of the Book.
Suppose f: A → B and g : B → C are functions.
(a) [BB] 1f g o ƒ is one-to-one and ƒ is onto, show that g it, one-to-one.
(b) If g o f is onto and g is one-to-one, show that ƒ is onto.
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