Venn and his successors believed that ellipses couldn’t portray all 32 regions required for a five-set diagram. Not until 1975 did mathematician Branko Grünbaum prove them wrong by example: ...

You may be asked to solve problems using Venn diagrams in an exam. It is really important you draw the Venn diagram and add information as you go along. This will help you keep an overview of what ...