Five marks exercise problems II — task. Mathematics State Board, Class 10.

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Find the sum to \(n\) terms of the series.

\(3 + 33 + 333 + … \) to \(n\) terms

The sum of the series \(=\)

\frac{i (i^{i} - 1)}{i} - \frac{i}{i}

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18. Five marks exercise problems II