6 people have seen Band Z and Band X, we can now fill this in on our Venn diagram. If we now look at Band X circle, we have all the sections bar one. Let’s add up the numbers we have so far in ...

You may well be familiar with Venn diagrams – the ubiquitous pictures of typically two or three intersecting circles, illustrating the relationships between two or three collections of things.

6 people have seen Band Z and Band X, we can now fill this in on our Venn diagram. Finally, if we now look at the Band X circle, we have all the sections complete except for one. Let’s add up ...