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

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

Set `A = \{1,3,4,5,9,12,15,17,19,20}`

Set `B = \{5,6,10,13,15,16,19}`

Determine the following:


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