Question 920171
Do you know what ∩ (intersection) and  ∪ (union) are?


A ∩ B := set of all elements that are in A *and* B


A ∪ B := set of all elements that are in A *or* B (or both)


The lowercase c denotes "complement" in this case (relative to U, universe), i.e. X^c gives the set of elements in the universe U that are *not* in X.


Given these definitions, the problems are very straightforward.