List of top Mathematics Questions on Operations on Sets asked in TS POLYCET

If $ A = \{a, b, c, d\} $ and $ B = \{d, c, b, a\} $ then
If A= {P,O,L,Y,T,E,C,H,N, I} and B = {E, X, A, M}, then \(A∩B =\)
If A = {1, 2, 3, 4, 5} and B={4, 5, 6, 7} then A-B=__