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Railways PYQCBT 1 2016

RRB NTPC · Question 5

7, 14, 21, 28 ..... the sum of the number series is 952, then the numbers in the series are A. 16 B. 17 C. 18 D. 19

  1. D

  2. B

  3. A

  4. C

Show answer & explanation

Answer: (C) A

Explanation

The series is 7 × (1, 2, 3, …). Sum of n terms = 7n(n + 1)/2 = 952, so n(n + 1) = 272 = 16 × 17, giving n = 16 terms.