Step 1:
The sum of the sequence is .
Formula for sum of sequences is .
Substitute , in the above formula.
Solution:
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=376f998c48f3326b4b2a8b970ff25c6c.png\")
..![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a54908279e553f14e72aaa094f2b6afa.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cb6b2e196ef69593c4b05a232644552e.png\")
, in the above formula.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=63bacec21cdd657a3ecc8e8545f196b1.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c084a7f75c0c3cf38439691f017301db.png\")
.