The sum is .
The number of terms in series is since series starts at and ends at .
The summation notation of the series is .
The summation notation of sum is .
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. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=db5e7633a86e1ae3c4bd38d07730dcf1.png\")
since series starts at ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7e3f493a6e0d5e0bcaf66ceb7ab8a424.png\")
and ends at ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9b1945fd5fc1417833f3e76707ee539a.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3a5954fe142f7b1c0add5c622f9f9814.png\")
.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3a5954fe142f7b1c0add5c622f9f9814.png\")
.