Two marks exercise problems I — task. Mathematics State Board, Class 10.

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Find the sum of the first

$n$ terms of the G.P.

$5, - 3, \frac{9}{5}, - \frac{27}{25}, ...$

$S_n$

$=$

$\frac{i}{i} (i - {(\frac{i}{i})}^{i})$

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