Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 12, 17, 24, 35, 48, 65, ?

  1. 84
  2. 82
  3. 86
  4. 83

Answer

A. 84

Solution

Differences are consecutive primes 5, 7, 11, 13, 17; next difference 19: 84.

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