Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 1, 6, 14, 25, 39, 56, ?

  1. 76
  2. 73
  3. 79
  4. 75

Answer

A. 76

Solution

Differences 5, 8, 11, … increase by 3; next difference is 20: 56 + 20 = 76.

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