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WBCS Preliminary Examination 2018 — General Studies · Question 145 of 200

Q145
ArithmeticNumber Series & Progressions
What should come in the place of the question mark in the following series? 3, 8, 6, 14, ?, 20
  1. a.12
  2. b.20
  3. c.42
  4. d.9

Answer: (D) 9

This is an alternating (two-in-one) series. Terms in odd places: 3, 6, ? - each increases by 3, so the missing term is 9. Terms in even places: 8, 14, 20 - each increases by 6. Whenever a series rises and falls irregularly, check the alternate terms separately.

Q144 Whole paperQ146