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Venn diagram questions appear in approximately 3–5 of the 29 Decision Making questions. They test your ability to interpret overlapping sets, read information from diagrams, and draw logical conclusions. This lesson covers the foundations: how to read and construct 2-circle and 3-circle Venn diagrams, what each region represents, and how to extract information accurately.
A Venn diagram uses overlapping circles within a rectangle to show the relationships between sets (groups). The rectangle represents the universal set (everything under consideration), and each circle represents a specific subset.
| Term | Meaning |
|---|---|
| Universal set (U) | Everything under consideration (the rectangle) |
| Set | A defined group (represented by a circle) |
| Intersection (A ∩ B) | Members belonging to BOTH A and B |
| Union (A ∪ B) | Members belonging to A OR B OR both |
| Complement (A') | Members NOT in A (everything in the rectangle outside A) |
| Only A | Members in A but not in any other set |
A two-circle Venn diagram creates four distinct regions:
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