Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 3, 3, 6, 18, 72, ?

  1. 288
  2. 360
  3. 90
  4. 365

Answer

B. 360

Solution

Multiply by 1, 2, 3, 4, … in turn: 72 × 5 = 360.

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