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The simple Excel function that decides if your formula spills or returns one value

If you decide to spill the results, you can then use the spilled range operator (#) to perform a calculation on the spilled range. Simply reference the first cell of the spilled range with a # ...
HowToGeek on MSN

How to Use the AVERAGEIF and AVERAGEIFS Functions in Excel

Excel's AVERAGEIF and AVERAGEIF functions let you find the average of a set of data. However, where they differ from the more ...