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indicate wether the series converges or diverges. if it converges find the sum....

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user7155198 | eNotes Newbie

Posted April 24, 2013 at 2:40 AM via web

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indicate wether the series converges or diverges. if it converges find the sum.

`sum_(n=1)^oo` `(e^n)/(e^(n-1))`

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oldnick | Valedictorian

Posted April 24, 2013 at 2:58 AM (Answer #1)

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`sum_(n=1)^oo e^n/e^(n-1)` `=sum_(n=1)^oo e^(n-(n-1))` `=sum_(n=1)^oo e^(n-n+1)` `=sum_(n=1)^oo e` `=lim_(n->oo) n"e" = oo`

Series diverges.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted April 24, 2013 at 3:10 AM (Answer #2)

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The series is denoted by `sum_(n=1)^oo (e^n/(e^(n-1)))`

`sum_(n=1)^oo (e^n/(e^(n-1)))`

= `sum_(n=1)^oo e^(n-n+1)`

= `sum_(n=1)^oo e`

= `e + e + e + e + ...`

= `oo`

As the value of `sum_(n=1)^oo (e^n/(e^(n-1)))` is `oo` , the series is divergent.

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