Welcome to CET 12th 2026 Course! In this section, we cover Chapter 3 of Reasoning: Classification (Find the Odd One Out). We have conducted a complete detailed class on YouTube covering word, number, letter, and figure classification. Below you can watch the complete class video, download class notes (both blank and annotated PDFs), read short revision notes, and solve interactive practice quizzes.
Download Class PDFs
Quick Revision Notes
1. Key Concepts & Core Methodology
Classification tests evaluate your ability to identify common properties or mathematical rules among a group of options and isolate the item that does not belong (the "Odd One Out").
2. Major Types of Classification
- Word Classification: Identify odd items based on category, physiological types (e.g., organs vs. general gland classifications), functional states (energetic vs. sluggish), or worker-product relationships.
- Number & Digit Summation: Sum individual digits to test for properties like divisibility or multiples (e.g., sum of digits forming multiples of 5).
- Number Pair Operations: Test multiplier patterns across pairs (e.g., base numbers multiplied by consecutive factors like \(k \times 6\) and \(k \times 7\)) or ratio relationships.
- Alphabet & Letter Series: Analyze forward/backward alphabetical positions, step-increment differences (e.g., \(+1, +3, +1\)), and vowel-consonant rules.
- Non-Verbal / Visual Classification: Analyze geometric element counts, internal layout partitions, and arrow/vector directional rotations.
3. Solved Concept Examples
- Digit Summation Rule: In \(7431 \rightarrow 7+4+3+1 = 15\) (multiple of 5), whereas \(6421 \rightarrow 6+4+2+1 = 13\) (not a multiple of 5).
- Factor Pair Ratio: Pairs like \((48, 56)\) use multipliers \(8 \times 6\) and \(8 \times 7\). The odd pair \((72, 81)\) uses multipliers \(9 \times 8\) and \(9 \times 9\).
- Alphabetical Positional Gap: Clusters following \(-2, +2\) gap steps like \(T(20)G(7)R(18)I(9)\) vs. deviations like \(N(14)H(8)L(12)I(9)\) where \(H \rightarrow I\) is \(+1\).
- Worker vs. Product: Mason makes Wall, Farmer produces Crop, but Chef : Cook pairs a profession with an action verb instead of its end product (Food/Meal).
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