Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 19, 21, 25, 33, 49, 81, ?

  1. 145
  2. 113
  3. 147
  4. 162

Answer

A. 145

Solution

Differences double: 2, 4, 8, … next difference 64: 81 + 64 = 145.

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