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Value of $\sum\limits_n x^n$

I have been working on this problem for awhile and have made efforts to try to resolve it. The question is: $$\sum_{n=1}^\infty 7(0.1)^{nāˆ’1}$$

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    thank you for responding, but i was asking if anyone knows how to find the partial sum of this expression. – 2012-11-04
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    I don't see any question, but a formula! – 2012-11-04

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