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Chapter 4: Introducing Worksheet Functions

In This Chapter

• The types of arguments used by functions

• How to enter a function into a formula

• Excel's function categories

A thorough knowledge of Excel's worksheet functions is essential for anyone who wants to master the art of formulas. This chapter provides an overview of the functions available for use in formulas.

What Is a Function?

A worksheet function is a built-in tool that you use in a formula. Worksheet functions allow you to perform calculations or operations that would otherwise be impossible. A typical function (such as SUM) takes one or more arguments and then returns a result. The SUM function, for example, accepts a range argument and then returns the sum of the values in that range.

You'll find functions useful because they

• Permit formulas to perform otherwise impossible calculations

• Speed up some editing tasks

• Allow conditional execution of formulas — giving them rudimentary decision-making capability

The examples in the sections that follow demonstrate each of these points.

`=(A1+A2+A3+A4+A5+A6+A7+A8+A9+A10)/10`