Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 2, 6, 1, 3, -2, -6, ?

  1. -11
  2. -18
  3. -16
  4. -8

Answer

A. -11

Solution

Alternately multiply by 3 and subtract 5: the next step is a subtraction, -6 − 5 = -11.

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