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Hi ,
I'm Mukesh and I will be happy to help you out with your question.
In Excel, you can use COUNTIF function to count the duplicates.
Select a blank cell adjacent to the first data of your list, and type this formula =COUNTIF($A$2:$A$9, A2) (the range $A$2:$A$9 indicates the list of data, and A2 stands the cell you want to count the frequency, you can change them as you need), then press Enter, and drag the fill handle to fill the column you need.
You can follow the steps in the below article for detailed description of the steps that you need to follow . Please note that the below article is an non Microsoft website .
https://www.extendoffice.com/documents/excel/1499-count-duplicate-values-in-column.html
I hope this information helps. If you have any questions please let me know and I will be glad to help you out.
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Best regards
Mukesh