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Railways PYQCBT 1 2020

RRB NTPC · Question 98

Select the number cluster from among the given options that can replace the question mark (?) in the following series. 2-4-6-8; 3-6-9-12; 4-8-12-16; ?

  1. 5-8-11-15

  2. 5-7-9-11

  3. 5-10-15-20

  4. 5-6-7-8

Show answer & explanation

Answer: (C) 5-10-15-20

Explanation

Each group is the first four multiples of a number: of 2, of 3, of 4, so next of 5: 5-10-15-20.