Question

Exercise 7.1
1. Which of the following collections are sets? Give reasons to support your answer
a) The collection of good batsman of Indian cricket team
b) The collection of all presidents of India.
c) The collection of all colours of a rainbow.
d) The collection of all intelligent girls in your class.
e) The collection of all composite numbers.
1) The collection of all the counting numbers.​

Answer 1

Answer:

Sets are: b, c, e, f

these are well defined collection of object or things... but in option a and d, they are not sets. for ex, if you think rohit sharma and kohli are good... but there may be other person who may think that they are not good players. so it is not a " well defined collection ".