Question

Welt defined collection of objects. It means
a) All the objects in the set should have a common feature or property and
b) It should be possible whether any given object belongs to the chestion or not
Examples of belt defined collections:
1) The collection of all even numbers
2) The collection of all odd positive integers
3) The collection of all months of a year​

Answer 1

1) The collection of all even numbers is a well defined

therefore , this is a set

2) all odd positive integers is a well defined collection

therefore , this is a set

3) months of a year is well defined

therefore this is a set