A Venn diagram is an illustration of the relationships between and among sets, groups of objects Usually, Venn diagrams are used to depict set intersections. The of diagram is used in scientific and engineering presentations, in theoretical mathematics, in computer applications, and in statistics.
a drawing is an example of a Venn diagram that are show the relationship among three overlapping sets X, Y, and Z. intersection relation is defined as the equal of the logic AND. An element is a member of the intersection of two sets. Venn diagrams are generally drawn within a large rectangle that denotes the universe, the set of all elements under consideration.
In this example, points that belong to none of the sets X, Y, or Z are gray. Points belonging only to set X are cyan in color; points belonging only to set Y are magenta; points belonging only to set Z are yellow. Points belonging to X and Y but not to Z are blue; points belonging to Y and Z but not to X are red; points belonging to X and Z but not to Y are green. Points contained in all three sets are black.
This is a practical example of how Venn diagram can illustrate a situation. Let the space be the set of all computers in the world. Let X represent the set of all notebook computers in the world. Let Y represent the set of all computers in the world that are connected to the Internet. Let Z represent the set of all computers in the world that have anti-virus software installed. If you have a notebook computer and surf the Net, but you are not worried about viruses, your computer is probably represented by a point in the blue region. If you get concerned about computer viruses and install an anti-virus program, the point representing your computer will move into the black area.
Exercise
textbook = 5
Excises = 3
test = 2
Teaching = 10
answer = ??
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