**Excel SUM function | Exceljet**
https://exceljet.net/functions/sum-function

WebThe SUM function returns the sum of values supplied. These values can be numbers, cell references, ranges, arrays, and constants, in any combination. SUM can handle up to 255 individual arguments. The SUM function takes multiple arguments in the form number1, number2, number3, etc. up to 255 total.

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