Question

The sum of first 20 terms of the sequence 0.7, 0.77, 0.777,..... is
(a) $\frac{7}{81}(179-10^{-20})$
(b) $\frac{7}{9}(99-10^{-20})$
(c) $\frac{7}{81}(179+10^{-20})$
(d) $\frac{7}{9}(99+10^{-20})$

Answer 1

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