Give an example of a function from N to N that is a)

Chapter 2, Problem 2.3.16

(choose chapter or problem)

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. c) both onto and one-to-one (but different from the identity function). d) neither one-to-one nor onto.

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