Arithmetic
Arithmetic
Series Formula
In general, any arithmetic sequence can be paired to find the same sum as the first and last terms and there will be
pairs. Therefore, the following formula can be used to determine the arithmetic series with any number of terms.
![SeriesFormula1 SeriesFormula1](https://claregladwinresd.glk12.org/pluginfile.php/1011/mod_book/chapter/595/Sequence_and_Series/Images/SeriesFormula1.png)
![SeriesFormula2 SeriesFormula2](https://claregladwinresd.glk12.org/pluginfile.php/1011/mod_book/chapter/595/Sequence_and_Series/Images/SeriesFormula2.png)
![SeriesFormula3 SeriesFormula3](https://claregladwinresd.glk12.org/pluginfile.php/1011/mod_book/chapter/595/Sequence_and_Series/Images/SeriesFormula3.png)
![SeriesFormula4 SeriesFormula4](https://claregladwinresd.glk12.org/pluginfile.php/1011/mod_book/chapter/595/Sequence_and_Series/Images/SeriesFormula4.png)
Where a 1 is the first term, a n is the last term, and n is the number of terms.