The correct notation used to show a set involves the use of curly brackets { } to enclose the elements of the set. Each element inside the set is separated by commas. For example, a set A containing elements a, b, c, and d is written as: A={a,b,c,d}A=\{a,b,c,d\}A={a,b,c,d} Here, the set is denoted by a capital letter (A), and the elements inside the curly brackets are usually lowercase letters or numbers

. In summary:

• Use curly brackets { } to indicate the set.
• List the elements inside the brackets, separated by commas.
• Represent the set itself by a capital letter.

This notation clearly shows the elements belonging to the set and is the standard way to write sets in mathematics