#### The Venn diagram shows four sets, A, B, C, and D.

Each of the sixteen regions represents the intersection over a subset of {A, B, C, D}.
Can you find the intersection of all four sets?
The tree diagram below displays the sixteen possible subsets. Try to match each of the subsets with
a region in the diagram. (Check your answers)

#### Here are two more Venn diagrams with four sets

#### Do you know why this is not a Venn Diagram for 4 sets?

#### This Venn diagram shows all possible intersections of five sets.
There are 32 regions in the diagram. Each set is divided into 16 regions.

eobrien@gmu.edu