If two sets A and B are such that (A−B)=A, then A∩B=
If A = {1, 3, 5, 7, 9, 11, 13, 15, 17}, B ={2, 4, ......, 18} and N, the set of natural numbers is the universal set, then (A′∪[(A∪B)∩B′]) is
If A, B and C are three sets such that A∩B=A∩C and A∪B=A∪C, then