It's possible a Venn diagram can have three (or more) sets depicted within them. A set of pupils were asked which sports they played in school, from a list of Football, Hockey, Netball and None.
Learn how to draw and interpret Venn diagrams with this BBC Bitesize Maths article. For students between the ages of 11 and 14. Intersection of two sets Learn about Venn diagrams and the relevance ...