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`s_{n}=\frac{u_{1}\left(1-r^{n}\right)}{1-r}` `s_{\infty}=\frac{u_{1}}{1-r}\ \left|r\right|<1`
By @SatvinderEdtech Singh
`s_{n}=\frac{u_{1}\left(1-r^{n}\right)}{1-r}` `s_{\infty}=\frac{u_{1}}{1-r}\ \left|r\right|<1`
By @SatvinderEdtech Singh