Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 3, 8, 17, 30, 47, 68, ?

  1. 89
  2. 97
  3. 93
  4. 92

Answer

C. 93

Solution

Differences 5, 9, 13, … increase by 4; next difference is 25: 68 + 25 = 93.

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