Numbers are (2³ - 1), (3³ - 1), (4³ - 1), (5³- 1), (6³ - 1), (7³ - 1) etc. So, the next number is (8³ - 1) = (512 - 1) = 511.
7, 26, 63, 124, 215, 342, (....)
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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.