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6, 9, 15, 21, 24, 28, 30

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6, 9, 15, 21, 24, 28, 30 Answer: 28

Each of the numbers except 28, is a multiple of 3.

Question context

This question is part of 📏 Arithmetic Aptitude 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.