Logical Venn Diagrams
Logical Venn Diagrams
Logical Venn diagrams represent relationships between groups using overlapping circles. The task is to identify which diagram correctly shows the relationship among 2-3 given categories.
Key Idea
Determine whether groups are subsets, overlapping, or disjoint. A group that is entirely inside another is a subset; partial overlap means some members are shared; separate circles mean no common members.
Core Rules
Subset Relationship
If all members of A are also members of B, draw A's circle entirely inside B's circle
When one category is a specific type of another (e.g., Dogs inside Animals).
Overlapping Relationship
If some members of A are also in B (but not all), draw two partially overlapping circles
When categories share some but not all members (e.g., Engineers and Cricketers).
Disjoint Relationship
If A and B share no members at all, draw two separate non-touching circles
When categories are mutually exclusive (e.g., Dogs and Cats).
Three-Group Analysis
Analyze all three pairs (A-B, B-C, A-C) independently, then combine into one diagram
When three categories are given — check each pair before drawing.
Relevant Exams
Logical Venn diagrams appear as 2-3 questions in SSC CGL. They are visual and fast to solve once the subset/overlap/disjoint framework is internalized.