Evaluate the sum to n terms — task. Mathematics State Board, Class 10.

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Figure out the sum to \(n\) terms of the series 7 \(+\) 77 \(+\) 777 \(+\)\(…\)

The sum to \(n\) terms \(=\)

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

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8. Evaluate the sum to n terms