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WBCS Preliminary Examination 2015 — General Studies · Question 103 of 200

Q103
ArithmeticNumber Series & Progressions
What should come in the place of question mark in the following series? 3, 8, 6, 14, ?, 20
  1. a.11
  2. b.10
  3. c.8
  4. d.9

Answer: (D) 9

Two interleaved series: odd positions (3, 6, ?) increase by 3 → 3, 6, 9. Even positions (8, 14, 20) increase by 6. The missing term (5th term, odd position) is 9.

Q102 Whole paperQ104