Question: 4. Give an example of a function from N to N that is (a) one-to-one but not onto. (b) onto but not one-to-one. (e) both

4. Give an example of a function from N to N that is (a) one-to-one but not onto. (b) onto but not one-to-one. (e) both onto and one-to-one (but different from the identity function () = x). (d) neither one-to-one nor onto

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