This function allows for summation by row of a large range without using fill-down.
It takes a single argument, the range and outputs the sum by row for each row.
Note: this cheat has the honor of being the "first community contribution" to spread_cheats.
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We've built an interactive tutorial in Google Sheets where it's easy to see how the function works. You can read the definition, edit examples, and do some practice examples to verify that you understand how to use the function.
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