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Don't trust Excel's COUNTA function to count non-blank cells—here's a better method

Counting non-empty cellsThe COUNTBLANK-COUNTA conflict (and how to fix it)Summary: Choosing the right counting functionIn ...
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You need to know what the double unary operator (--) does in Excel

I used to see the double dash (--) in Excel spreadsheets and wonder what it did. It's an essential shortcut to force Excel to treat TRUE and FALSE as the numbers 1 and 0, meaning you can easily sum or ...