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Question Number 152437 by fotosy2k last updated on 28/Aug/21

Commented by fotosy2k last updated on 28/Aug/21

$$plshelp$$

Answered by qaz last updated on 28/Aug/21

$$\underset{\mathrm{n}=1}{\sum ^{\mathrm{\infty }}}{(-1)}^{\mathrm{n}}\frac{1}{3^{\mathrm{n}}}=\frac{-\frac{1}{3}}{1-(-\frac{1}{3})}=-\frac{1}{4}$$

Commented by fotosy2k last updated on 30/Aug/21

$$thankyou$$

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