Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 1.5, 9, 3, 7.5, 4.5, 6, , ?

  1. 6, 4
  2. 6.5, 4.5
  3. 6, 5
  4. 6, 4.5

Answer

D. 6, 4.5

Solution

Two interleaved series: the odd-position terms add 1.5 (1.5, 3, 4.5, 6), and the even-position terms subtract 1.5 (9, 7.5, 6, 4.5).

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