Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 18, 21, 27, 39, 63, 111, ?

  1. 207
  2. 159
  3. 210
  4. 222

Answer

A. 207

Solution

Differences double: 3, 6, 12, … next difference 96: 111 + 96 = 207.

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