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  3. 2 let f a b a prove that...

Question: 2 let f a b a prove that...

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2, Let f : A → B (a) Prove that if S C A then s c f-i(f(s). (b) Prove that if f is one-to-one, then S = f-1(f(S)). (c) Show by an example that the two sets are not equal in general

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