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The roster method is defined as a way to show the elements of a set by listing the elements inside of brackets.
An example of the roster method is to write the set of numbers from 1 to 10 as {1, 2, 3, 4, 5, 6, 7, 8, 9 and 10}.
An example of the roster method is to write the seasons as {summer, fall, winter and spring}.