Civil Service Exam Reviewer · Number Series · hard

What number(s) should complete the series: 3, 10, 21, 34, 51, 70, ?

  1. 89
  2. 93
  3. 95
  4. 92

Answer

B. 93

Solution

Differences are consecutive primes 7, 11, 13, 17, 19; next difference 23: 93.

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