JEE Math Practice Question
The sum of first 20 terms of the sequence 0.7, 0.77, 0.777,........,is
- A.$${7 \over {81}}\left( {179 - {{10}^{ - 20}}} \right)$$
- B.$$\,{7 \over 9}\left( {99 - {{10}^{ - 20}}} \right)$$
- C.$${7 \over {81}}\left( {179 + {{10}^{ - 20}}} \right)$$
- D.$${7 \over 9}\left( {99 + {{10}^{ - 20}}} \right)$$
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