The one time they must be used is when a set is in roster form of set notation. You may see them used in place of regular parentheses in equations and expressions. Excel inserts curly brackets at the beginning and end of the formula for you.I just call them curly brackets.
Otherwise, the formula must be entered as a legacy array formula by first selecting the output range, entering the formula in the top-left-cell of the output range, and then pressing CTRL+SHIFT+ENTER to confirm it. The set of all integers between -10 and -15. The set of all the natural numbers less than 10. Examples of sets written using the verbal description method: The set of colors on the American flag. We have to ensure that the statement is well-defined.
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