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

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

Set `A = \{1,3,4,8,9,11,12,13,15,16,17,18,20}`

Set `B = \{2,3,4,5,7,9,12,13,14,18,19,20}`

Determine the following:


`n(A)=`
`n(B)=`