Let A, B, C be sets. Let f : A → B and g : B → C be functions. a) Prove that if f and g are bijective, then so is g ◦ f. b) If g ◦ f is bijective, are f and g? Prove or disprove.

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Q: disprove: a relation that is symmetric and transitive must TProve also be reflexive. or

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