Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 100, 97, 94, 90, 87, 84, 80, ?

  1. 76
  2. 78
  3. 77
  4. 75

Answer

C. 77

Solution

The differences repeat in a cycle of -3, -3, -4. Following the pattern, the next difference is -3: 80 - 3 = 77.

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