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Railways PYQCBT 1 2020

RRB NTPC · Question 20

Select the number from among the given options that can replace the question mark (?) in the following series. 8, ?, 30, 105, 472.5

  1. 11

  2. 13

  3. 14

  4. 12

Show answer & explanation

Answer: (D) 12

Explanation

The multipliers increase by 1: 8 × 1.5 = 12, 12 × 2.5 = 30, 30 × 3.5 = 105, 105 × 4.5 = 472.5.