Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 5, 23, 10, 20, 20, 17, , ?

  1. 14, 40
  2. 30, 14
  3. 40, 15
  4. 40, 14

Answer

D. 40, 14

Solution

Odd positions multiply by 2 (5, 10, 20, …); even positions subtract 3 (23, 20, 17, …). Next: 40, 14.

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