RRB Group D · Bite-size lessons

Similarities and Differences

About 6 min · General Intelligence and Reasoning · English

Time worked out from the lesson's 396 words at 150 words a minute, plus a minute for each question.

Similarities and Differences questions test your ability to quickly spot patterns, common features, and odd elements within a group of words, numbers, figures, or objects. The format is straightforward: you're given four or five items, and you must identify either the one that is similar across a given pair, or the one that doesn't belong to the group (the "odd one out").

Key ideas

• Odd One Out principle: Three or four items share a common property; one does not. Identify the shared link, then spot the exception.
• Similarity matching: Given two groups or pairs, find what quality or category unites them (e.g., all are metals, all are measuring instruments).
• Multiple classification bases: Items can be grouped by meaning (synonyms, categories), spelling (number of letters, vowels), numerical properties (even/odd, prime, perfect square), or visual features (shape, symmetry).
• Elimination strategy: When unsure, compare each answer choice against the others. The correct odd item will differ in exactly one consistent way from the rest.
• Context clues: Words may relate by function (all are tools), origin (all are rivers in India), or usage (all are food items). Numbers may share divisibility, digit patterns, or mathematical properties.

Watch out for

• Surface-level matching → Deep categorical thinking: Students pick the first difference they see (e.g., word length) without checking if a deeper category (meaning, function) is the real link. Fix: Always verify the category across all items before finalizing the odd one.
• Ignoring numerical properties → Check multiple properties: In number sets, students forget to check prime vs. composite, or perfect square vs. non-square. Fix: Test divisibility, square/cube status, even/odd, and digit sums systematically.
• Confusing synonyms with antonyms → Read carefully: A question asking for "similar words" vs. "odd word" requires opposite strategies. Fix: Underline the instruction—are you finding the match or the exception?

Quick reference

• Odd One Out = find the item that breaks the common pattern among others.
• Check meaning first (category, function), then spelling/numerical properties.
• For numbers: test even/odd, prime, perfect square/cube, divisibility.
• For words: test synonyms, categories (animals, tools, places), letter count.
• For figures: count sides, check symmetry, observe shading and rotation.

Check yourself: 3 questions

This lesson is cut from the topic's note, not rewritten. Fact-checked on 21 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.

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