Given the set U = {1, 2, 3, 4, 5, 6, 7), A = {2, 4, 5, 6), and B = {4, 5, 7)
B' is a set that contains elements in the universal set that are not in B
Hence B' = (1, 2, 3, 6)
A n B' is a set that contains elements common to both A and B'.
Hence
A n B' = (2, 6)