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A set is described as well defined, meaning membership is:
ADecidable
BDivisible
CDebatable
DDuplicable
Answer & Solution
Correct answer: A. Decidable
1. Well defined rules out ambiguity.
2. For any object it must be settled whether it belongs.
3. A set is a well-defined collection of objects.
4. So the answer is decidable.
_Source: NCERT Class XI Mathematics, Ch 1 'Sets'_
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