graphical representations
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most Venn diagrams are used in survey taking
Venn diagrams are named after their inventor, John Venn.
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.
Venn diagrams helps us arrange numbers in odrder