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RCMP Police Aptitude Battery (RPAB) · Question

Series: 3, 7, 13, 21, ?

The differences between consecutive numbers increase by 2 each time: (+4, +6, +8). The next difference should be +10, so 21 + 10 = 31.

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Question: Series: 3, 7, 13, 21, ?

Answer options:

  • 29
  • 31
  • 33 ✅ 35

Correct answer: 35

Explanation: The differences between consecutive numbers increase by 2 each time: (+4, +6, +8). The next difference should be +10, so 21 + 10 = 31.

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