To show common numbers between the sets.
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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.
The answer depends on the Venn diagram.
Venn diagrams were conceived around 1880 by John Venn.
John Venn
A Venn diagram or a set diagram is a diagram that shows all possible logical relations between a finite collection of sets.