1. 2. 3. Let function f :N i N be defined as f (n) sum of the digits of the number n. Findf(S) ifthe sets 120, 201, 45332b f(S) Find a positive integer n so that f (n) = 9. Is the function f onto (surjection)? Why? 3x+2 Let function f : R -9 R be defined as: What is the largest possible domain of the function f? Is the function f one-to-one (injection)? Why? Is the function f onto (surjection)? Why? Is the function f bijection)? Why? Find the function , that is inverse to f on the largest possible domain for f Find if the set S Let function f : R -9 Z be defined as: f (X) Find f (S) if the set S ={-3.7, 1.2, 3.2b Is the function f onto (surjection)? Why?