Q1 of 145 Page 4

Which of the following are sets? Justify your answer.
The collection of all those students of your class whose ages exceed 15 years.

As the collection of all those students of your class whose ages exceed 15 years is known and can be counted, i.e. well – defined.

∴, this is a set

Which of the following are sets? Justify your answer.

The collection of all interesting books.

Which of the following are sets? Justify your answer.

The collection of all short boys of your class.

Which of the following are sets? Justify your answer.

The collection of all rich persons of Kolkata.

Which of the following are sets? Justify your answer.

The collection of all persons of Kolkata whose assessed annual incomes exceed (say) Rs 20 lakh in the 4 financial years 2016-17.

Which of the following are sets? Justify your answer.The collection of all those students of your class whose ages exceed 15 years.