Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 2, 7, 17, 32, 52, 77, ?

  1. 102
  2. 112
  3. 107
  4. 106

Answer

C. 107

Solution

Differences 5, 10, 15, … increase by 5; next difference is 30: 77 + 30 = 107.

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