Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 2, 3, 6, 18, 108, ?

  1. 126
  2. 216
  3. 1,944
  4. 2,052

Answer

C. 1,944

Solution

Each term is the product of the two before it: 18 × 108 = 1,944.

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