If you need to average a list of values in Microsoft Excel that contain duplicates without including the duplicates, don't fret over a complex expression when you can easily remove those duplicates.

How to Use Excel to Show Only Duplicate Values. Business issues such as incorrect transactions, data entry errors, technical glitches and poor system design may cause duplicate values in your data ...

One of the most common requests I receive from users is how to identify duplicate and unique values in Microsoft Excel. The easiest way I know is to apply a conditional format. In a nutshell, a ...

By using the Highlight Cells Rules, you can highlight duplicate cells in your Excel worksheet to avoid confusion and mistakes.

If you wish to count the same or duplicate values in a column only once in Excel or the count of occurances of duplicate values, read this article.