MathematicsMedium178×since 2002Q5290The sum of first 20 terms of the sequence 0.7, 0.77, 0.777,........,isA781(179−10−20){7 \over {81}}\left( {179 - {{10}^{ - 20}}} \right)817(179−10−20)B 79(99−10−20)\,{7 \over 9}\left( {99 - {{10}^{ - 20}}} \right)97(99−10−20)C781(179+10−20){7 \over {81}}\left( {179 + {{10}^{ - 20}}} \right)817(179+10−20)D79(99+10−20){7 \over 9}\left( {99 + {{10}^{ - 20}}} \right)97(99+10−20)Check answerSkip