Enable text based alternatives for graph display and drawing entry

Try another version of this question

Let S={1,2,3,...,18,19,20} be the universal set.

Let sets A and B be subsets of S, where:

Set A={1,4,5,6,8,9,11,13,14,16,20}

Set B={8,9,11,14,15,16,20}

Determine the following:


n(A)=
n(B)=