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Check out this informative video tutorial from Apple on how to create formulas with Quick Formula in Numbers '09. iWork '09, the office productivity suite from Apple, is the easiest way to create documents, spreadsheets, and presentations. Writing and page layouts are easy in Pages. Numbers gives you simple ways to make sense of your data.
There are some formulas can help you to quickly count the number of unique values in a range. 1. Enter this formula =SUMPRODUCT(1/COUNTIF(A1:A10,A1:A10)) into a blank cell. 2. Then press Enter key, and the number of the unique value will be displayed. Tips: 1.