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WBCS Preliminary Examination 2020 — General Studies · Question 160 of 200

Q160
ArithmeticNumber Series & Progressions
Numbers are placed in the figure below on the basis of some rule. Find the correct alternative to replace the question mark: Row 1: 5, 9, 14, 20; Row 2: 9, 17, 27, ?
  1. a.35
  2. b.37
  3. c.39
  4. d.41

Answer: (C) 39

Row 1 increases by +4, +5, +6; Row 2 increases by +8, +10, +12 (double the first row's differences), so the next difference is +12, giving 27 + 12 = 39.

Q159 Whole paperQ161