The numbers are squares of odd natural numbers, starting from 5 up to 15. So, 36 is wrong.
25, 36, 49, 81, 121, 169, 225
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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.