Given that for sets A and B, in a universal set E, A ? ? B then A ? ? (A ? ? B)1 is

Given that for sets A and B, in a universal set E, A $?$ B then A $?$(A $?$ B)1 is

Answer Details

A $\subset$ B means A is contained in B i.e. A is a subset of B(A $\cap$ B)1 = A1
A(A $\cap$ B)1 = A $\cap$ A1
The intersection of complement of a set P and P1 has no element
i.e. n(A $\cap$ A1) = $\varphi$