A or B or C = A + B + C - A and B - A and C - B and C - 2 (A and B and C)
I'm not sure by the way;
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The answer depends on the Venn diagram.
Venn diagrams were conceived around 1880 by John Venn.
A Venn diagram or a set diagram is a diagram that shows all possible logical relations between a finite collection of sets.
John Venn
Yes. A Venn diagram is one of many types of graphic organizers.