this is a 6 part question

4. Condsider the set X of all strings made from characters in the set {a,b,c}. Let f be the function from X to X defined by f() = fro any string X

a. find f(aba)

b. find |f()|, where is the null string

c. fins a string such that f() = bbbb

d. if || = n, what is |f()|?

e. is the function f onto? why or why not

f. is the function f on-to-one? why or why not?