Question: Please explain it Question 4: n if n is even n-3 if n is odd. Consider the functionf: Z-Z given by f(n) (a) Is f

Please explain it

Please explain it Question 4: n if n is even n-3 if

Question 4: n if n is even n-3 if n is odd. Consider the functionf: Z-Z given by f(n) (a) Is f injective? Prove your answer. Is f surjective? Prove your

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