3. Let F : X → Y and G: Y → Z be functions.
i. If G â—¦ F is injective, then F is injective.
ii. If G â—¦ F is surjective, then G is surjective.
iii. If G â—¦ F is constant, then F is constant or G isconstant.
iv. If F is constant or G is constant, then G â—¦ F isconstant.
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