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need help please ... state theorems used 3. (10 marks) Let f be a 1-1 function and let A, B be sets. Prove that f

need help please ... state theorems used

3. (10 marks) Let f be a 1-1 function and let A, B be sets. Prove that f [A - B] = f[A] - f[B]. Is this still true if f is not 1-1? (Yes or no is fine for this part)

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