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Venn diagram questions are a regular feature of the UCAT Decision Making subtest. They test your ability to organise information into overlapping categories and draw logical conclusions from the resulting diagram. These questions can appear as standard MCQs or in drag-and-drop format where you place items into the correct regions of the diagram.
A Venn diagram uses overlapping circles to represent sets. Each circle represents a category, and the overlapping regions represent items that belong to multiple categories.
A two-circle Venn diagram has four regions:
| Region | Description |
|---|---|
| Only in A | Items in set A but NOT in set B |
| Only in B | Items in set B but NOT in set A |
| A ∩ B (intersection) | Items in BOTH set A AND set B |
| Neither | Items in neither set A nor set B (outside both circles) |
A three-circle Venn diagram has eight regions:
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