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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 ...
How-To Geek on MSN

A Step-by-Step Guide to Using SUMIFS in Microsoft Excel

The SUMIFS function works in a similar way with text as with numbers, but there are two key differences. First, text in Excel formulas must always go inside double quotes, and second, you can use ...