The sum of first 20 terms of the sequence \( 0.7,0.77,0.777, \ldots...

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The sum of first 20 terms of the sequence \( 0.7,0.77,0.777, \ldots \ldots \ldots \). is
(1) \( \frac{7}{9}\left(99-10^{-20}\right) \)
(2) \( \frac{7}{81}\left(179+10^{-20}\right) \)
(3) \( \frac{7}{9}\left(99+10^{-20}\right) \)
(4) \( \frac{7}{81}\left(179-10^{-20}\right) \)
\( \mathrm{P} \)
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