Civil Service Exam Reviewer · Number Series · medium

What number(s) should complete the series: 3, 6, 9, 15, 24, 39, ?

  1. 64
  2. 54
  3. 48
  4. 63

Answer

D. 63

Solution

Each term is the sum of the two before it: 24 + 39 = 63.

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