1 U= (x:x is a whole number. x < 10) is a universal set. A = (y:y is an odd number) and B = {z:z is a factor of 12) are the subsets of U. answer the following questions (a) Write A - B in listing method. (b) Show the relationship of U, A and B in a Venn-diagram. (c) Verify that: AUB=AnB (d) Write the relation between the sets AUB and AB with reason.​