Each number is double the preceding one plus 1. So, the next number is (255 x 2) + 1 = 511.
15, 31, 63, 127, 255, (....)
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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.