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## kaykim95 2 years ago True or false?? This is a convergent geometric series

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1. kaykim95

2. estebananaya

i think its convergent, because you can put the argument of the sum like (-3/5)^(i+1) over -5

3. Lumenaire

It is convergent. It's common ratio is -3/5, the absolute value of which is smaller than one. So it does converge.

4. kaykim95

so true?

5. Lumenaire

yes

6. ZeHanz

Rewrite it a little:$\sum_{i=1}^{\infty}\frac{ 3^{i+1} }{ (-5)^{i+2} }=\sum_{i=1}^{\infty}\frac{ 3^{i+1} }{ (-5)(-5)^{i+1} }=-\frac{ 1 }{ 5 }\sum_{i=1}^{\infty}\left( -\frac{ 3 }{ 5 } \right)^{i+1}$Now read @Lumenaire 's answer (again)!

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