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Railways PYQCBT 1 2016

RRB NTPC · Question 26

The product of two consecutive odd numbers is 399. Find the lower of them. A. 17 B. 19 C. 21 D. 23

  1. B

  2. C

  3. A

  4. D

Show answer & explanation

Answer: (A) B

Explanation

Two consecutive odd numbers are n and n + 2. Since √399 ≈ 20, try 19 and 21: 19 × 21 = 399. So the lower number is 19.