Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 6, 36, 33, 1089, ?

  1. 1185921
  2. 1092
  3. 1086
  4. 1083

Answer

C. 1086

Solution

Alternately square and subtract 3: 6² = 36, −3 → 33, ² → 1089, −3 → 1086.

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