The series increases by a constant difference of 0.2 each time (0.1, 0.3, 0.5, 0.7), so the missing number is 0.5.
Fill in the blank: 0.1, 0.3, ___, 0.7
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Question context
This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the GHQ Army Selection & Recruitment Directorate (Civilian Personnel Wing) preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.