Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 15, 16, 20, 27, 37, 50, ?

  1. 66
  2. 63
  3. 69
  4. 65

Answer

A. 66

Solution

Differences 1, 4, 7, … increase by 3; next difference is 16: 50 + 16 = 66.

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