Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 9, 18, 14, 28, 24, 48, ?

  1. 96
  2. 40
  3. 72
  4. 44

Answer

D. 44

Solution

Alternately multiply by 2 and subtract 4: the next step is a subtraction, 48 − 4 = 44.

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