A picture of a Venn diagram is in the related links.
They are useful because they help you map out problems such as "If there are 3 students in math, 5 students in science and 6 students in total, how many are in both math and science?" To this, you can use the Venn diagram to reason that since there seem to be 8 students in total if math and science are separate, there must be 2 students in both classes.
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Venn diagrams helps us arrange numbers in odrder
Yes.
most Venn diagrams are used in survey taking
Venn diagrams are named after their inventor, John Venn.
Venn diagrams were conceived around 1880 by John Venn, a British logician and philosopher.