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Railways PYQCBT 2 2017

RRB NTPC · Question 37

Which number will replace (?) in the following series? 4, 5, 8, 10, 12, 15, 16, 20, ?, 25

  1. 24

  2. 21

  3. 20

  4. 22

Show answer & explanation

Answer: (C) 20

Explanation

Two series alternate: 4, 8, 12, 16, 20 (multiples of 4) and 5, 10, 15, 20, 25 (multiples of 5). The missing term is 20.