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in this video were going to work on some practice problems that focuses on writing sets using set build notation and the roster method so lets start with this problem write the set of natural numbers that is less than 6 in roster notation and in set builder notation so first we need to know what exactly are natural numbers natural numbers are integers that start with 1 and go up so natural numbers are basically positive numbers so 1 2 3 4 5 6 7 8 these are all natural numbers 0.5 is not a natural number 0 or negative 8 is not a natural number now we want to write this in a set where its less than six so we should only include one to five because five is less than six so were not including six so first lets write it in roster notation in roster notation you simply need to list the elements set a contains the elements 1 2 3 4 and 5. and we need to contain the elements using braces so thats how you can describe set a using roster notation now lets describe it using set builder not