Venn diagrams usually are found in textbooks illustrating the fundementals of set theory and probability. They are good means of presenting graphically relationships between sets of data. An excellent link from Wikipedia explains much more about Venn diagrams. See related link. You can find many examples on the internet.
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He used them in his studies of logic.
No country was ever a Venn diagram.
Named after John Venn, a British logician (1834-1923), the Venn Diagram is commonly used to portray sets and their relationships. Using intersecting circles and other geometric shapes, they help in conceptualizing logical relationships, such as syllogisms.See: venn-diagram
He created the "Venn diagram" which is used when dealing with "sets" in mathematics.
No a venn diagram is not a graphic source.