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WBCS Preliminary Examination 2020 — General Studies · Question 161 of 200

Q161
ArithmeticNumber Series & Progressions
What number should come next in the sequence 6, 11, 21, 36, 56, ___?
  1. a.78
  2. b.81
  3. c.82
  4. d.86

Answer: (B) 81

The differences between consecutive terms increase by 5 each time (+5, +10, +15, +20, +25), so 56 + 25 = 81.

Q160 Whole paperQ162