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Everything You Need to Know About Array Constants in Excel

Array constants can only contain text in double quotes, plain numbers (no currency symbols or percent signs), or Boolean ...
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How to count Number of Unique and Distinct Values in Column in Excel

The syntax for counting the number of unique values from a list of a column using the array formula is as follows: =SUM(IF(COUNTIF(<first cell from which you count the number of unique values>:<last ...