How can we find duplicate values across multiple columns? For this task, we’ll use two Excel helper formulas: One to concatenate the columns you’re comparing; a second to count the duplicates.

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.

The most obvious way to increment a number in Excel is to add a value to it. Start with any value in cell A1, and enter "=A1+1" in cell A2 to increment the starting value by one. Copy the formula ...

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