Question: f: N--> N defined by f(x) = x-1, x > 2 and f(1) = f(2)= 1. Prove: f(x) is on to but not one-one.

f: N--> N defined by f(x) = x-1, x > 2 and

f: N--> N defined by f(x) = x-1, x > 2 and f(1) = f(2)= 1. Prove: f(x) is on to but not one-one.

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