In set notation this is B = {1, 4, 9}. 30 people answered a survey about whether they have a dog or a cat. The Venn diagram shows the information from the survey. 13 people have got a dog.

The point in the interior of the figure represents the elements of the set. Such a representation is called a Venn diagram. Similarly, one can work out the Venn Diagram notation for Union of Sets ...

Venn diagrams get tricky when they include more than three sets – here, a fourth set has to be stretched across the other three. (Image: Kopophex/Wikimedia Commons) The stretching method starts ...

It may look like a flower, but this is actually a new Venn diagram-- one that for the first time manages to represent 11 sets of data. Venn diagrams are a simple and elegant way to represent the ...

Now Khalegh Mamakani and Frank Ruskey at the University of Victoria in British Columbia, Canada, have hit on the first simple, symmetric 11-set Venn diagram (pictured). One of the sets is outlined ...