NCERT Class 11 Solutions Sets. The NCERT solutions for Class 11 Mathematics have been made by Mathematics teacher of one of the best CBSE school in India. These NCERT solutions have been made to give detailed answers and expanations of the concepts as per NCERT which can be easily understood by the students. Refer to other links also to download mathematics NCERT solutions, worksheets, sample papers and Exemplar Solutions.

**Which of the following are sets? Justify our answer.**

**(i) **The collection of all months of a year beginning with the letter J.

**(ii) **The collection of ten most talented writers of India.

**(iii) **A team of eleven best-cricket batsmen of the world.

**(iv) **The collection of all boys in your class.

**(v) **The collection of all natural numbers less than 100.

**(vi) **A collection of novels written by the writer Munshi Prem Chand.

**(vii) **The collection of all even integers.

**(viii) **The collection of questions in this Chapter.

**(ix) **A collection of most dangerous animals of the world.

**Answer**

**(i) **The collection of all months of a year beginning with the letter J is a well-defined collection of objects because one can definitely identify a month that belongs to this collection. Hence, this collection is a set.

**(ii) **The collection of ten most talented writers of India is not a well-defined collection because the criteria for determining a writer’s talent may vary from person to person. Hence, this collection is not a set.

**(iii) **A team of eleven best cricket batsmen of the world is not a well-defined collection because the criteria for determining a batsman’s talent may vary from person to person. Hence, this collection is not a set.

**(iv) **The collection of all boys in your class is a well-defined collection because you can definitely identify a boy who belongs to this collection. Hence, this collection is a set.

**(v) **The collection of all natural numbers less than 100 is a well-defined collection because one can definitely identify a number that belongs to this collection.

Hence, this collection is a set.

**(vi) **A collection of novels written by the writer Munshi Prem Chand is a well-defined collection because one can definitely identify a book that belongs to this collection.

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