These Venn Diagrams are a lot of fun!
http://en.wikipedia.org/wiki/Venn_Diagram
http://en.wikipedia.org/wiki/Introduction_to_Boolean_algebra
http://en.wikipedia.org/wiki/Venn_Diagram
http://en.wikipedia.org/wiki/Introduction_to_Boolean_algebra
Answer Key
You could try this link for help. It's not the best information, but it can get you started. It's by Elizabeth Stapel - "Venn Diagrams & Set Notation." of Purplemath. http://www.purplemath.com/modules/venndiag2.htm.
Higher Math Links