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WBCS Preliminary Examination 2022 — General Studies · Question 186 of 200

Q186
ArithmeticNumber Series & Progressions
A number series is given with one wrong term. Identify the wrong term given: 53 59 63 67 71
  1. a.53
  2. b.63
  3. c.67
  4. d.71

Answer: (A) 53

The series should increase by +4 each time: 55→59→63→67→71. Each consecutive term increases by 4. The first term should be 55, not 53. Therefore, 53 is the wrong term.