Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 5, 12, 24, 31, 62, 69, ?

  1. 138
  2. 76
  3. 145
  4. 137

Answer

A. 138

Solution

Alternately add 7 and double: the next step is doubling, 69 × 2 = 138.

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