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FUNCTIONS

            A function is a predefined formula in Excel. It starts with the = (equal to) sign. Functions are used
            for computing complex calculations. There are many built-in functions provided by Excel. They
            accept arguments and return values.

            Arguments are input to the functions. The values should be given in between opening and closing
            ( ) parenthesis. For example, SUM(A1:A5) A1 and A5 are arguments and Sum is a function.
            Some rules for using the Functions are:

               All Excel functions must begin with = sign

               Function name must be a valid Excel name.
               Function must be followed by opening and closing parenthesis.

               Most of the functions must contain an argument within it.

            Let’s discuss the categories of function.


            MATHEMATICAL FUNCTIONS
            Some mathematical functions with their examples are given below.



                  Function                           Purpose                               Example


                                                                                   Input: =SUM(4,8,12,16)
             SUM(range)             It returns the sum of a range.
                                                                                   Output: 40

                                                                                   Input: =PRODUCT(4,2,8)
              PRODUCT(range)        It multiplies the values in a range of cells.
                                                                                   Output: 64
              MOD                   It returns the  remainder  after a number  is  Input: =MOD(8,5)
              (number, divisor)     divided by the divisor.                        Output: 3

                                                                                   Input: =SQRT(81)
              SQRT(number)          It returns the square root of the given number.
                                                                                   Output: 9

                                                                                   Input: =INT(14.25)
              INT(number)           It rounds the number to an integer value.
                                                                                   Output: 14
              POWER                 It  returns the  result  of  a  number  raised  to  Input: =POWER(5,3)
              (number, power)       some power.                                    Output: 125
                                    It returns the count of the number of values in  Input: =COUNT(4,8,12)
              COUNT(range)
                                    the selected range.                            Output: 3

              ROUND(number,         It  returns a  number  after rounding  to  the  Input: =ROUND(35.666,2)
              number of digits)     specified digits.                              Output: 35.67


                                                                                   Input: =ABS(–25)
              ABS(number)           It returns the absolute value of a given number.
                                                                                   Output: 25


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