For any set A,A∪A′=U, where U is the universal set.
If U={2, 4, 6, 8, 12, 14, 17}, where U is the universal set and some set A={1, 4, 6, 11, 12}. The set A' is
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 ________.