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Railways PYQCBT 1 2020

RRB NTPC · Question 91

Select the number from among the given options that can replace the question mark (?) in the following series. 1, 9, 25, 49, 81, ?

  1. 91

  2. 111

  3. 121

  4. 94

Show answer & explanation

Answer: (C) 121

Explanation

These are squares of odd numbers: 1², 3², 5², 7², 9², so the next is 11² = 121.