Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 6, 36, 32, 1024, ?

  1. 1020
  2. 1048576
  3. 1028
  4. 1016

Answer

A. 1020

Solution

Alternately square and subtract 4: 6² = 36, −4 → 32, ² → 1024, −4 → 1020.

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