Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 3, 8, 18, 38, 78, ?

  1. 156
  2. 160
  3. 158
  4. 118

Answer

C. 158

Solution

Each term = previous × 2 + 2: 78 × 2 + 2 = 158.

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