The pattern is + 84, - 168, + 336,.....i.e. + 84, - (84 x 2), + (84 x 2²), ..... So, missing term = 815 - (84 x 2³) = 815 - 672 = 143.
563, 647, 479, 815, ?
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Question context
This question is part of 💬 Verbal 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.