Discrete structures methd only no programmi

4. Consider the following functions from N into N i. IN(n)n ii. fn) 3n+1 iii, g(n) = n + 1 + (-1)" iv. h(n) min(n+1,100) v. k(n) max (0,n-7) (a) Which of these functions are one-to-one? (b) Which of these functions map N onto N