Let D={2,3,4} and E={1,2,3} define the Funcation f: D->E by the rule

f(1)=1, f(2)=3, f(3)=1 and f(4)=2

a)What is the image of 3

b) what is the codonmain of f

c)draw the digraph representing f

d) is the funcation injective or subjectiv enad why

so i have done question similiar to this but i am totally stumped by this one do if any help would be much appricated and the more detailed the more i can learn form it

many many thanks

Tom