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Math Help - Infinite Series #2

  1. #1
    Senior Member mollymcf2009's Avatar
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    Infinite Series #2

    Find c.

    \sum^{\infty}_{n=0} e^{nc} = 8
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  2. #2
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    \sum\limits_{n = 0}^\infty  {e^{cn} }  = \frac{1}<br />
{{1 - e^c }}\;,\;e^c  < 1
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