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JEE Main 2013

JEE Main 2013 Mathematics question on Sequences and Series

The sum of first 20 terms of the sequence 0.7, 0.77, 0.777, ... is
  1. A.
    781(179−10−20)\frac{7}{81}(179 - 10^{-20})
  2. B.
    79(99−10−20)\frac{7}{9}(99 - 10^{-20})
  3. C.
    781(179+10−20)\frac{7}{81}(179 + 10^{-20})
  4. D.
    79(99+10−20)\frac{7}{9}(99 + 10^{-20})
Show answer

Correct option: C

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