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  3. 6 let x y be sets and let f ...

Question: 6 let x y be sets and let f ...

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6. Let X, Y be sets, and let f : X → Y be a function. Given A, B C X, and C, D CY, give a proof or a counterexample: (c) f(X \ A) Y\f(A) (f) f(Y \ C) = X \ f-1 (C)
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