If A and B are two sets such that 
, then write B’ − A’ in terms of A and B.
Here, A⊂B ⇒ B'⊂A'
∴ A'⋂B'=B’
B'∖A'=B'∖(A'⋂B')
=B'∖B'
=ϕ
1
If A and B are two sets such that , then write B’ − A’ in terms of A and B.
Here, A⊂B ⇒ B'⊂A'
∴ A'⋂B'=B’
B'∖A'=B'∖(A'⋂B')
=B'∖B'
=ϕ