Problem $2$: Define two sets A and $B$ that are somehow related to each other.

For example, A could be the days in the week $A=\{M,T,W,T,F\}$ and B could

be the classes you are taking CSCI $2011,$ Math $123,$dots.

Answer the questions below based on your definition of A and $B.$

$($a$)$ What is $AB?$

$($b$)$ Consider how A and $B$ are related. $($e$.$g$.$ in the example above CSCI $2011$

meets on $M,W,F.$