Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 18, 23, 30, 39, 50, 63, ?

  1. 78
  2. 76
  3. 80
  4. 77

Answer

A. 78

Solution

Differences 5, 7, 9, … increase by 2; next difference is 15: 63 + 15 = 78.

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