Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 2, 3, 5, 9, 17, ?

  1. 34
  2. 35
  3. 33
  4. 25

Answer

C. 33

Solution

Each term = previous × 2 − 1: 17 × 2 − 1 = 33.

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