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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 # ...
How-To Geek on MSN

You need to know the difference between a range and an array in Excel

Excel processes the range (A1:A10) by converting it into an array in memory. This array is what Excel works with to calculate the sum. The distinction is subtle but important: while the range is the ...