Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: A1, C4, E9, G16, ?

  1. I25
  2. I20
  3. H25
  4. I24

Answer

A. I25

Solution

The letters skip one each time (A, C, E, G, I), and the numbers are perfect squares 1², 2², 3², 4², 5² (1, 4, 9, 16, 25).

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