Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 3, 9, 18, 54, 108, 324, ?

  1. 648
  2. 972
  3. 432
  4. 649

Answer

A. 648

Solution

Multiply alternately by 3 and 2: 324 × 2 = 648.

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