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प्रश्न
Which collection does NOT form a well-defined set?
पर्याय
The first three letters of the English alphabet
All three-sided figures
All difficult problems in a Mathematics book
Red flowers in a garden
MCQ
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उत्तर
All difficult problems in a Mathematics book
Explanation:
"Difficult" is subjective and varies from person to person, making this collection not well-defined. The other options have objective, clear criteria.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
