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You can list all the elements of the set. Or, another way is to use set-builder notation.

For example {x | x < 5} means the set of all real numbers less than 5. You could not list all of these since there are an infinite number.

If you have {x |3 x < 5, x is a natural number } the set of all natural numbers less than 5 and greater than 3, so it is two. You could write this set as {2} or in words say the set that contains the number 2.

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Q: What are the two ways of describing set in mathematics?
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