If U is the Universal set and A is a subset of U, then A′=U−A.
If A and B are subsets of the universal set U, then show that,
A⊂B⇔A∪B=B
If ∪ = {2, 4, 6, 8, 10, 12, 14, 17}, where ∪ is Universal set and some set A = {1, 4, 6, 9, 11, 12}, then set AC is ________.