Which of the following collections are sets?
Odd numbers
Yes, collection of all odd numbers is a set because it is well defined and we can easily tell whether a number is odd or not.
A set is a well-defined collection of distinct objects.
All the natural numbers less than 20 which are perfect square
Which of the following collection are sets? Give reasons to support your answer.
The collection of all composite numbers.
The collection of all the counting numbers.
Which of the following collections are sets ? Justify your answer :
(i) A collection of all natural numbers less than 50.
(ii) The collection of good hockey players in India.
(iii) The collection of all girls in your class.