| When
                there is a comma (,) between cell references in a
                function, each cell is used individually to
                perform the calculation. Example: =SUM(A1,A2,A3) is the same as
                the formula =A1+A2+A3
 
 When there is a colon (:) between cell
                references in a function, each cell and all those
                between are used to perform the calculation.
 
 Example:
 =SUM(A1:A3) is the same as the
                formula =A1+A2+A3
 
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