SSC GD · Bite-size lessons

Similarities and Differences

About 6 min · General Intelligence and Reasoning · English

Time worked out from the lesson's 435 words at 150 words a minute, plus a minute for each question.

Similarities and Differences is a core reasoning topic in SSC GD that tests your ability to identify what items share in common and what makes one item distinct from a group. These questions appear in two main forms: finding the odd one out (differences) or grouping similar items together (similarities). The examiner wants to see whether you can spot patterns based on categories like meaning, spelling patterns, numerical properties, position in a series, or visual characteristics.

Key ideas

• Odd One Out principle: In a set of four or five items, three or four share a common property while one does not. Your job is to identify the misfit.
• Similarity grouping: Sometimes you must identify which items belong together based on a shared trait — meaning, function, category, or mathematical property.
• Category-based logic: Items can be grouped by semantic meaning (all are fruits), grammatical type (all are verbs), numerical properties (all are prime numbers), or positional patterns (all are vowels).
• Verbal vs. non-verbal formats: Verbal questions use words and require vocabulary knowledge; non-verbal use letters, numbers, or figures and test logical or arithmetic reasoning.
• Elimination technique: Compare each item against the others. The moment three items share a trait that the fourth lacks, you've found your answer.

Watch out for

• Rushing without checking all items: Students pick the first item that seems different without verifying the pattern across all options. Always confirm that three items truly share a property before finalising the odd one out.
• Confusing category levels: Mixing broad and narrow categories. For example, treating "fruit" and "mango" as both odd when three items are vegetables. Always operate at the same level of classification.
• Ignoring numerical properties: In number questions, students focus only on size (largest/smallest) and miss properties like even/odd, prime/composite, or perfect square status. Check multiple mathematical traits.

Quick reference

• Odd one out = find the item that does NOT share the common property of the other three.
• For words: check meaning, grammar, category, function and origin.
• For numbers: test even/odd, prime/composite, divisibility, squares/cubes.
• For letters: verify position in alphabet, vowel/consonant, or sequence pattern.
• Compare systematically: item 1 vs. 2, then 1 vs. 3, then 1 vs. 4 to spot the pattern.

Check yourself: 3 questions

This lesson is cut from the topic's note, not rewritten. Fact-checked on 18 Oct 2026: an AI-assisted check of this note against cited sources; the errors it found were corrected that day. Some errors may remain. The questions are from Shishya's validated question bank.

Read the full noteFlashcards for this topic