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the Roster form is the set builder form
This method is also known as

method.
In this method, a set is represented by listing all the elements of the set, the elements being separated by commas and are enclosed within flower brackets { }.
In your example:

the set of natural numbers between

and

; it means in set

will be all numbers greater than

and less than

.
Solution:
J = {2,3,4,5,6} is the


.