Let’s add up the numbers we have so far in this circle: So 16 people are left over to go in the section that is blank. We can now fill this in on our Venn diagram. 16 visitors had seen Band X ...

A Venn diagram is a way of grouping different items. These groups are known as sets. We have a set of golf clubs or a set of dishes – these are just groups of those items. We write a set using a ...