A singleton set has one proper subset, which is the empty set. A singleton set, by definition, has exactly one element (e.g., {a}), and the empty set {} is its only subset that is not equal to the original set.
Number of proper subsets possessed by singleton is ______?
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This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.