You can specify a set either by listing all of its members (not an option for sets that are very large or even infinite), or by specifying some rule for elements to be a part of the set.
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method in wrinting a set
method of concerning
1. listing method i.e A = {1, 2, 3, 4, 5} 2. set builder notation i.e B = {x | 1 < x < 10 and 3 | x}
the ways in naming a set are: roster method, rule method and set builders
The roster method represents a set of something. In algebra, the roster method is used to describe a simpler set that is difficult to describe.