Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 4, 77, 13, 69, 22, 61, 31, ?

  1. 40
  2. 45
  3. 61
  4. 53

Answer

D. 53

Solution

Two alternating series: 4, 13, … (+9) and 77, 69, … (−8). The next term belongs to the second: 61 − 8 = 53.

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