There are two sets for any given function, the domain and the range. The range is the set of outputs and the set of inputs is the domain.
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The domain of a function encompasses all of the possible inputs of that function. On a Cartesian graph, this would be the x axis. For example, the function y = 2x has a domain of all values of x. The function y = x/2x has a domain of all values except zero, because 2 times zero is zero, which makes the function unsolvable.
The domain is the set of values that x may take that gives back an answer that makes sense. The range is the set of values that are possible results of the function. the "log" function does not accept 0 or negative values on its domain and returns negative, zero and positive numbers (ie all real values). The next function does not appear properly but you could figure it out
The set of values for which the function is defined.
If you mean Excel, or similar spreadsheets, you can use the sum() function.
it is called the Domain......