Two sets are shown with the following Venn Diagram

The yellow region is denoted by 1.

Blue region is denoted by 2.

The common region is denoted by 3.

(i) A - B denotes region 1

B denotes region (2+3)

So their intersection is a null set

(A - B)B = ø

(ii) B - A denotes region 2

A denotes region (1+3)

So their union denotes region (1+2+3) which is the union of A and B

A(B - A) = AB

(iii) A - B denotes region 1
AB denotes region 3
Their union denotes region (1+3) which is set A
(A - B)(AB) = A

(iv) AB denotes region (1+2+3)
(AUB) - B denotes region (1+2+3) - (2+3) = 1
A - B denotes region 1
(AB) - B = A - B

(v) Wrong question