For which numbers is this convergence?

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venke
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Hi,

I need to know for which nubers of x the serie is convergence.

1.JPG


Is this possible whith d'Alombert? I have tried, but with no result.

Greets,
venke
 
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Your series is an infinite geometric series with a=x/(x+1). This series converges for |a|<1. You should be able to find what is the range of x for convergence.