it is called the Domain......
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The set of values for which the function is defined.
Domain The set of all possible results: range.
The range of a function is the set of all of the possible values that it can take on as an output value. You find the range by inspecting the function and seeing first what the domain is, and then what the range would be for that domain. The domain, then, is the set of all of the possible values that it can take on as an input value.
range
If you mean Excel, or similar spreadsheets, you can use the sum() function.