Offline paper
Mathematics · 2013
JEE Main 2013 · 2013-04-07 Offline · Q21
The sum of first 20 terms of the sequence 0.7,0.77,0.777, … …, is:
The sum of first $\displaystyle 20$ terms of the sequence $\displaystyle 0.7,0.77,0.777, \ldots \ldots$, is :
Official answer
(4)
$\displaystyle \frac{7}{81}\left(179+10^{-20}\right)$
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JEE Main 2013 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.