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Excel's REDUCE is clever, but this old-school function is what I trust

REDUCE deserves credit for what it can do, especially if you work exclusively in the newest version of Excel and need highly ...
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How to use UNIQUE() to populate a dropdown in Microsoft Excel

How to use UNIQUE() to populate a dropdown in Microsoft Excel Your email has been sent Populating a dropdown with a dynamic list is easy thanks to Microsoft Excel’s UNIQUE() dynamic array function.