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Look at this series: 31, 29, 24, 22, 17, ... What number should come next?

Review the verified answer and explanation for this DemoPaper-Pakistan past-paper question on CampusFin.

Look at this series: 31, 29, 24, 22, 17, ... What number should come next? Answer: 15

This is a simple alternating subtraction series, which subtracts 2, then 5.

Question context

This question is part of 🧩 Logical Reasoning within the broader 🧠 Aptitude Mastery subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.