Question

which predefined feature is known as functions in exel ?
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Answer 1

Microsoft Excel contains many predefined, or built-in, formulas, which are known as functions....

Functions are predefined formulas that perform calculations by using specific values, called arguments, in a particular order, or structure. Functions can be used to perform simple or complex calculations. You can find all of Excel's functions on the Formulas tab on the Ribbon: Excel function syntax.