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Railways PYQCBT 1 2020

RRB NTPC · Question 45

Select the number from among the given options that can replace the question mark (?) in the following series. 2, 6, 12, 20, 30, 42, ?

  1. 50

  2. 52

  3. 60

  4. 56

Show answer & explanation

Answer: (D) 56

Explanation

The terms are n(n + 1): 1×2, 2×3, …, 6×7 = 42. Next: 7 × 8 = 56.