Question

Let S be the universal set, where:
S = {1, 2, 3, ..., 18, 19, 20}
Let sets A and B be subsets of S, where:
Set A= {1, 2, 6, 8, 14, 15, 17, 18, 19, 20}
{2, 6, 7, 9, 10, 11, 13, 15, 16, 18, 19}