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WBCS Preliminary Examination 2020 — General Studies · Question 162 of 200

Q162
ReasoningAnalogy, Classification & Odd One Out
Find the odd one out:
  1. a.27
  2. b.64
  3. c.81
  4. d.125

Answer: (C) 81

27 = 3³, 64 = 4³, 125 = 5³ are all perfect cubes, whereas 81 is not a perfect cube (it is 3⁴ or 9²), making it the odd one out.

Q161 Whole paperQ163