Write the following sets in roster from:
A = {x : x is a natural number, 30 ≤ x < 36}.
Natural numbers = 1, 2, …, 30, 31, 32, 33, 34, 35, 36, …
The elements of this set are 30, 31, 32, 33, 34 and 35 only
So, A = {30, 31, 32, 33, 34, 35}