The given set can be described as; set of integers that are multiples of 3 but not less than 6 and not greater than 12.
One very good way to specify a set is to give a verbal description of its elements. This is known as the Descriptive form of specification.
The description must allow a precise determination of which elements belong to the set and which elements do not.
One example of how to write the given set in descriptive form is;
The set A = {a, e, i, o, u}
The given set A contains only vowels and as such we can represent the it in descriptive form as follows.
A is the set of all vowels in the English alphabet
Now, we are given the set {6,9,12}.
Now, the set contains integers that are multiples of 3. Thus, we can describe it as;
A set of integers that are multiples of 3 but not less than 6 and not greater than 12.
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