Civil Service Exam Reviewer · Number Series · hard

What should complete the series: XLV, XXXIX, XXXIII, XXVII, ?

  1. XXI
  2. XX
  3. XXII
  4. XV

Answer

A. XXI

Solution

In Arabic numerals: 45, 39, 33, 27 (subtract 6). Next: 21 = XXI.

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