The number that is not a square — Aptitude Question
The number that is not a square: Which one does not belong? 25, 36, 49, 62 Answer and worked solution on CodeKairo.
- Topic: Analogies & Classification
- Section: Logical Reasoning
- Difficulty: Easy
- Time target: 35 seconds
Question
Which one does not belong?
25, 36, 49, 62
Options
- 25
- 36
- 49
- 62
Show the answer and the worked solution
Correct answer: D. 62
Worked solution
- 25 = 5², 36 = 6², 49 = 7².
- 62 is not a perfect square.
Answer: 62.
The idea
Check the squares first. A number sitting between two consecutive squares cannot itself be one.
Shortcut. Squares never end in 2 (only in 0, 1, 4, 5, 6 or 9), so 62 falls on its units digit alone.
Common trap. 36 — the only even square, which invites an odd-versus-even split; but 62 is even too, so parity divides them 2–2 and only squareness leaves one out.
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