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For a set to be well defined, membership must be:
AAdjustable
BChangeable
CDecidable
DDebatable
Answer & Solution
Correct answer: C. Decidable
1. A collection is a set only if its members are settled.
2. Given any object one must be able to answer yes or no.
3. So membership has to be decidable.
_Source: NCERT Class 11 Mathematics, Chapter 1, Sets._
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