Functions and Formulas

Hello....
Functions and Formulas/Formulae ... Hmmm..


Let's start..

Formula
          * an expression used to perform calculations
          * always begin with an equal ( = ) sign
          * it may contain constants, cell references, ranges,etc.

For example :
         =A1+A2
         =A4*A5

Next,

Function
          * predefined formula
          * may require arguments as inputs

Example :
          =SUM(A1,A2)
          =PRODUCT(10,5)

There are some errors sometimes you will notice,
Some are :
          ####
          #NAME?
          #NULL!


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