Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 1/5, 2/15, 3/45, 4/135, ?

  1. 5/140
  2. 5/405
  3. 4/405
  4. 6/405

Answer

B. 5/405

Solution

Numerators increase by 1; denominators multiply by 3: 5/405.

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