1. |A∪B| -> max- (m+n) when A∩B is ∅
min- max(m,n) when one set is a subset of another.
2. |A∩B| -> max- min(m,n) (cardinality of smaller set)
min- 0 when sets are disjoint.
3.|A−B| -> max- |n| i.e cardinality of A . When sets are disjoint
min. - 0 .When sets are equal.
4.|A⨁B| -> max- (m+n). When sets are disjoint
min. - 0 when A= B
5. $|\overline{A}|$ -> max - U when A is an empty set
min. - 0 when A=U