Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 2, 5, 10, 13, 26, 29, ?

  1. 32
  2. 61
  3. 58
  4. 57

Answer

C. 58

Solution

Alternately add 3 and double: the next step is doubling, 29 × 2 = 58.

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