Each object in a set is called an element or a member of a set. One method of describing a set is called the roster method, in which elements are listed between braces, with commas between the elements. The order in which we list elements isn’t important:
Often, we will name sets by using a capital letter. We might name the set of objects in the left circle in the diagram in Question 2 using the letter A.
Use the roster method to list the elements of the left circle:
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