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.

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eobrien@gmu.edu