Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 6, 36, 35, 1225, ?

  1. 1500625
  2. 1226
  3. 1224
  4. 1223

Answer

C. 1224

Solution

Alternately square and subtract 1: 6² = 36, −1 → 35, ² → 1225, −1 → 1224.

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