You may be asked to solve problems using Venn diagrams in an exam ... Now add up the numbers we have so far in Band Y circle: 20 + 11 + 3 = 34. You can see we have 34 people so far, but we ...

Our opening quote contended that Venn diagrams are overrated. Even those who agree must admit that they have a curious allure. Take the sets of interesting topics in logic, in geometry and in ...