Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 5, 9, 17, 33, 65, ?

  1. 130
  2. 131
  3. 129
  4. 97

Answer

C. 129

Solution

Each term = previous × 2 − 1: 65 × 2 − 1 = 129.

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