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Railways PYQCBT 1 2016

RRB NTPC · Question 39

Mohan starts to calculate the sum of all odd natural numbers less than 83. What result does he get? A. 1456 B. 1681 C. 1437 D. 1671

  1. C

  2. A

  3. B

  4. D

Show answer & explanation

Answer: (C) B

Explanation

The odd natural numbers below 83 are 1, 3, 5, …, 81, which is 41 numbers. The sum of the first n odd numbers is n², so the sum = 41² = 1,681.