By default, Excel uses the A1 reference style, which refers to columns as letters, and refers to rows as numbers. These letters and numbers are called row and column headings. However, Excel can be configured to display column labels as numbers instead of letters.
Why Do My Excel Columns Have Numbers Video
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Some people may prefer this method but it can also be confusing, especially if it is enabled inadvertently.
Change method back to normal
To change from this method back to normal go to File > Options and then Formulas and
un-tick the R1C1 reference style box.

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