A Venn diagram is basically showing two activities that a group of people do, and the place where the two circles overlap shows the amount of people which do BOTH the activities. For example, if the two circles represent tennis and Basketball. Those who are in the basketball circle, and not in the overlapped section, they only do basketball. Those in the tennis circle, and not in the overlapped section, only do tennis. Those in the overlapped section do both basketball and tennis.
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He created the Venn diagram and wrote books about what he did.
you can have 2-3 circles, but for heavy information you can have 5 circles. I'm not sure if there can be more i would have to look into that.
well in fact the difference is one has 2 circles and one has 3
Venn diagrams were introduced in 1880 by John Venn (1834-1923) in a paper entitled On the Diagrammatic and Mechanical Representation of Propositions and Reasonings in the "Philosophical Magazine and Journal of Science", about the different ways to represent propositions by diagrams. Venn himself did not use the term "Venn diagram" and referred to his invention as "Eulerian Circles."