In Odd Sentence Out, one sentence doesn't belong. Learn the four signs that reveal the outlier — theme mismatch, pronoun errors, logical gaps, and tone shifts.
In an Odd Sentence Out (OSO) question, you are given 5 sentences that are meant to form a paragraph — but one sentence doesn't belong. Your job is to find and remove the odd sentence so the remaining 4 form a coherent, well-connected paragraph.
This is like a puzzle where 4 pieces fit together and 1 piece belongs to a different puzzle.
Odd Sentence Out typically appears 1–2 times in CAT VARC. It's one of the fastest question types when you know the patterns — experienced students solve it in 30-45 seconds.
A sentence is odd if it does one or more of these:
The most reliable signal. Read all 5 sentences and identify the common theme. The odd sentence introduces something unrelated.
Sentence Set:
A. "Electric vehicles have reduced carbon emissions in urban areas."
B. "Charging infrastructure is expanding rapidly in major cities."
C. "The history of steam engines dates back to the 18th century."
D. "Government subsidies have made EVs more affordable."
E. "Battery technology is improving year over year."
Theme: Electric vehicles and their current ecosystem (A, B, D, E).
Odd sentence: C — introduces steam engine history, which is a completely different topic.
If a sentence uses "he/she/they/it/this/these/those/such" without a prior reference point in the other 4 sentences, it probably doesn't belong — OR it reveals where it must go in the paragraph.
For OSO, look for sentences that introduce pronouns pointing to something never mentioned:
A. "The CEO announced record profits."
B. "He credited the success to the new product line." ← "He" refers to CEO in A — they connect.
C. "However, she disagreed with his optimism." ← WHO is "she"? Never introduced → likely ODD.
D. "Analysts praised the company's strategy."
E. "The new product had been in development for three years."
"She" in C has no antecedent → C is the odd sentence.
After removing a sentence, the remaining 4 should flow logically — each sentence following naturally from the previous.
How to check: Write out the 4 sentences in the order that makes best sense. If the sequence flows without gaps, you've found the right odd sentence.
After removing sentence B from a set:
A → C → D → E should flow naturally.
If removing C creates a better flow, C is odd — not B.
Academic paragraphs maintain consistent formality. If one sentence uses informal language, contractions, or slang among formally-written sentences, it stands out.
Similarly, if a paragraph is personal and reflective, a sentence with dry statistics stands out.
Each sentence should address the SAME level of specificity as others:
| Term | Meaning |
|---|---|
| Odd Sentence | The one sentence that doesn't belong |
| Antecedent | The noun a pronoun refers back to |
| Coherence | Logical and smooth flow of ideas |
| Theme | The central topic or idea of the paragraph |
| Tone | The level of formality or emotional register |
| Register | The style of language (formal, informal, academic) |
❌ Choosing a sentence as "odd" just because it's less interesting or more complex.
❌ Not verifying that the remaining 4 form a coherent paragraph.
❌ Missing a subtle pronoun-reference break.
❌ Confusing "this is the odd sentence" with "this would go last" — different question types.
Find the odd sentence out:
Odd Sentence Out requires finding the one sentence that disrupts the paragraph's coherence. The theme test identifies which sentence belongs to a different topic. The pronoun test catches sentences with references to non-existent antecedents. After removing the odd sentence, verify that the remaining four form a logical, well-connected paragraph. Practice builds pattern recognition — experienced students identify the odd sentence within 30 seconds.
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