Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 3, 6, 12, 15, 30, 33, ?

  1. 36
  2. 66
  3. 69
  4. 65

Answer

B. 66

Solution

Alternately add 3 and double: the next step is doubling, 33 × 2 = 66.

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