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Sets — MATHS STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceMATHSSets1 Mark
Question
The given collections are sets or not? Justify your answer: The collection of difficult topics in mathematics.
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Answer

It is not a set as the term 'difficult' is not well defined. A topic may be difficult for one person but may not be difficult for another person, so the term 'difficult' is vague.

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