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  3. 4 suppose x and y are sets f x...

Question: 4 suppose x and y are sets f x...

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4) Suppose X and y are sets, f : X → y is a function, and B-Y (a) Prove that f(f (B))C B. (b) Prove that if f is onto, then f(f(B) B. (c) Give an example of X, y, f, and B such that f(f-i(B)) B

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