Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 5, 72, 10, 65, 15, 58, , ?

  1. 51, 20
  2. 20, 53
  3. 20, 51
  4. 21, 50

Answer

C. 20, 51

Solution

Two series alternate: 5, 10, 15 (+5) and 72, 65, 58 (−7). Next: 20, then 51.

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