Set is a
__
well defined collection
__
of objects.

Set is well defined -

i.e. it doesn’t change from person to person

__
Example
__

**
Collection of natural numbers less than 6
**

-a-

Natural numbers = 1, 2, 3, 4, 5, 6, 7,…

Natural numbers less than 6 = 1, 2, 3, 4, 5

Since Collection of natural numbers until 5 is known and can be counted (well –defined)

**
It is a set
**

-ea-

**
Collection of 5 best cricketers of the world
**

-a-

Some people will say Sachin Tendulkar is the best, some say Virat Kohli.

Some say MS Dhoni.

Since you can have different players, I can have different players. So, the collection varies from person to person.

So, the collection is not well-defined.

Hence it is
**
not a set.
**

-ea-

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