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 ...

Venn diagrams typically use overlapping circles to show all possible relationships ... (Image: Frank Ruskey and Mark Weston) The next prime number after 7 is 11, but it was tough to find a simple ...