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.

A Venn diagram can show data sets such as preferences ... The elements in set A are 1, 3, 5, 7 and 9. In set notation this is A = {1, 3, 5, 7, 9}. Image caption, Set B can be described as the ...