Which of the following is a well-defined set in the technical sense used in NCERT Class XI Mathematics?
AThe collection of ten most talented writers of India
BThe collection of all natural numbers less than 100
CA team of eleven best cricket batsmen of the world
DA collection of most dangerous animals of the world
Answer & Solution
Correct answer: B. The collection of all natural numbers less than 100
A set must be a well-defined collection — membership must be objectively decidable. 'Most talented', 'best', and 'most dangerous' are subjective and so do not form sets. Natural numbers less than 100 is unambiguous.
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