Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 1, 50, 4, 45, 9, 40, 16, , ?

  1. 35, 25
  2. 35, 20
  3. 30, 25
  4. 35, 24

Answer

A. 35, 25

Solution

Two interleaved series: the odd-position terms are perfect squares (1, 4, 9, 16, 25), and the even-position terms subtract 5 (50, 45, 40, 35).

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