UPSKILL MATH PLUS

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Find the value of \(r\), if:
 
\(1\) \(+\) \(r\) \(+\) \(r^2\) \(+\)\(…\) \(=\) \(\frac{8}{5}\)
 
\(r\) \(=\) ii
 
[Note: Do not reduce the fraction obtained.]