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Railways PYQCBT 2 2017

RRB NTPC · Question 108

What number comes next in the series? 1, 2, 3, 5, 8, _____

  1. 11

  2. 13

  3. 10

  4. 15

Show answer & explanation

Answer: (B) 13

Explanation

Each term is the sum of the two before it (Fibonacci): 1 + 2 = 3, 2 + 3 = 5, 3 + 5 = 8, 5 + 8 = 13.