Classification (Odd One Out) for SSC CGL
Master Pattern Recognition
1. Introduction
Classification, or "Odd One Out," is a common reasoning question where you need to identify the item that does not belong to a given group.
These questions test your observation, analytical skills, and knowledge of relationships.
2. Definition
In classification questions, you are given a set of items (words, numbers, or figures). One item differs from the rest based on a certain property. Your task is to identify the odd one.
Example: Dog, Cat, Elephant, Car
Here, all except Car are animals.
Answer: Car
3. Types of Classification
Based on Category/Group: One item does not belong to the group.
Example: Rose, Lily, Carrot, Tulip → Answer: Carrot (vegetable)
Based on Function: One item has a different purpose.
Example: Pen, Pencil, Eraser, Notebook → Answer: Notebook (used differently)
Based on Size/Quantity/Number: One item differs numerically.
Example: 2, 4, 6, 9 → Answer: 9 (all others are even)
Based on Direction/Position: In some non-verbal questions, one figure may differ in orientation or shape.
4. Previous Year SSC CGL Examples
2018 Tier I: Apple, Banana, Mango, Carrot
Answer: Carrot
2019 Tier I: Circle, Triangle, Square, Rectangle, Cube
Answer: Cube
2020 Tier I: Dog, Cat, Cow, Chair
Answer: Chair
These examples show how SSC CGL tests simple observation and classification skills.
5. Strategy to Approach Classification Questions
- Identify the common property among most items.
- Compare each item to see which one does not fit.
- Use elimination — check all options carefully.
- Practice verbal and non-verbal classification regularly.
- For tricky numerical or logical sets, look for hidden patterns.
6. Quick Recap
- Classification questions test your ability to spot differences in a group.
- Common types: Category, Function, Number, and Visual orientation.
- Identify the common property first, then select the odd one.
- Regular practice improves speed and accuracy.
7. Practice Questions
Try solving these to test your understanding:
1. Rose, Tulip, Lily, Car
2. 2, 4, 6, 9
3. Table, Chair, Sofa, Pen
4. Lion, Tiger, Leopard, Snake
5. Pencil, Eraser, Sharpener, Notebook
Click for Answers
1. Car (Others are flowers)
2. 9 (Others are even numbers)
3. Pen (Others are furniture)
4. Snake (Others are big cats)
5. Notebook (Others are writing/stationery tools)
Attempt these before checking answers. Remember to identify the property that sets the odd one apart.
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