⭐ Sabse Important Points · एक नज़र में
- Alphabet Positions: A=1, B=2, ..., Z=26. Use this to check sums, differences, or products of letters.
- Category: Group words by their class (e.g., all fruits except one vegetable).
- Vowel/Consonant: Check if the odd word has a different vowel count or pattern.
- Spelling Pattern: Check for common prefixes, suffixes, or double letters.
- Number Properties: Check for perfect squares, cubes, primes, multiples, or digit sums.
- Letter Count: The odd word may have a different number of letters.
Introduction · परिचय
Classification (Odd One Out) is a core reasoning topic in SSC CHSL. It tests your ability to identify the item that does not share a common property with the others in a given set. The common property can be based on letters, numbers, words, or general knowledge. This topic requires observation, pattern recognition, and logical deduction.
Letter and Number Classification
In letter classification, the odd one out is determined by differences in alphabetical positions, vowel/consonant status, or letter patterns. In number classification, the odd one is based on properties like divisibility, squares, cubes, primes, or digit sums. Always check the most obvious property first, then move to less common ones.
- Check letter positions
- Check vowel/consonant
- Check number properties
- Check digit sum
- Identify odd one
⭐ Key Points · याद रखने वाली बातें
- Alphabet Positions: A=1, B=2, ..., Z=26. Use this to check sums, differences, or products of letters.
- Vowel/Consonant: Check if the odd word has a different vowel count or pattern.
- Number Properties: Check for perfect squares, cubes, primes, multiples, or digit sums.
- Digit Sum: Sum of digits may be constant or follow a pattern in all but one option.
✍️ Solved Example 1 · हल किया हुआ उदाहरण
❓ Question: Find the odd one out: 121, 144, 169, 200
✅ Solution: 200
💡 Explanation: 121=11², 144=12², 169=13² are perfect squares; 200 is not.
✍️ Solved Example 2 · हल किया हुआ उदाहरण
❓ Question: Find the odd one out: AB, CD, EF, GH, IJ, KL, MN, OP, QR, ST, UV, WX, YZ, AC
✅ Solution: AC
💡 Explanation: All pairs are consecutive letters (AB, CD, ...), except AC which skips B.
Word and General Knowledge Classification
In word classification, the odd one out is based on meaning, category, or general knowledge. Common categories include fruits, animals, colors, professions, etc. Sometimes the odd word differs in spelling pattern, number of letters, or syllable count. Use your general awareness to group words by their common characteristics.
| Letter/Number Classification | Word Classification |
|---|---|
| Based on alphabet/number properties | Based on meaning/category |
| Often uses positions, sums, squares | Often uses general knowledge |
| Example: 121, 144, 169, 200 | Example: Apple, Banana, Carrot, Mango |
⭐ Key Points · याद रखने वाली बातें
- Category: Group words by their class (e.g., all fruits except one vegetable).
- Spelling Pattern: Check for common prefixes, suffixes, or double letters.
- Letter Count: The odd word may have a different number of letters.
- Meaning: The odd word may have a different meaning or usage.
✍️ Solved Example 1 · हल किया हुआ उदाहरण
❓ Question: Find the odd one out: Apple, Banana, Carrot, Mango
✅ Solution: Carrot
💡 Explanation: Apple, Banana, and Mango are fruits; Carrot is a vegetable.
✍️ Solved Example 2 · हल किया हुआ उदाहरण
❓ Question: Find the odd one out: Dog, Cat, Lion, Table
✅ Solution: Table
💡 Explanation: Dog, Cat, and Lion are animals; Table is a non-living thing.
Practice Questions · खुद हल करके देखो
पहले खुद try karo, phir “Answer dekho” dabakar check karo. 👇
Q1Find the odd one out: 3, 5, 7, 9, 11
👀 Answer dekho
✅ Answer: 9
💡 Explanation: 3, 5, 7, and 11 are prime numbers; 9 is composite (3×3).
Q2Find the odd one out: Rose, Lotus, Lily, Mango
👀 Answer dekho
✅ Answer: Mango
💡 Explanation: Rose, Lotus, and Lily are flowers; Mango is a fruit.
Q3Find the odd one out: AZ, BY, CX, DW, EV, FU, GT, HS, IR, JQ, KP, LO, MN, NM, OL, PK, QJ, RI, SH, TG, UF, VE, WD, XC, YB, ZA, AB
👀 Answer dekho
✅ Answer: AB
💡 Explanation: All pairs are opposite letters (A-Z, B-Y, etc.), except AB which are consecutive.
⚠️ Common Mistakes · ये गलतियाँ बिल्कुल मत करना
- Assuming the first pattern you see is correct without checking all options; always verify the pattern applies to all but one.
- Overlooking simple properties like vowel count or letter position sums; start with the most obvious.
- In word classification, ignoring general knowledge categories; use your awareness of common groups.
⚡ Quick Revision · Exam से पहले 2 मिनट में दोहराओ
- Alphabet Positions: A=1 to Z=26; use for sums, differences, and patterns.
- Number Properties: Check squares, cubes, primes, and digit sums first.
- Word Categories: Group by meaning (fruits, animals, colors) and spot the odd one.
- Elimination: Test each option against the suspected pattern to confirm the odd one.