The sum \[\underbrace{{{(666..6)}^{2}}}_{n\,digits}+\underbrace{(888..8)}_{n\,digits}\]is equal to

\[\frac{4}{9}{{({{10}^{n}}-1)}^{2}}\]

The sum \[\underbrace{{{(666..6)}^{2}}}_{n\,digits}+\underbrace{(888..

1.	The sum \[\underbrace{{{(666..6)}^{2}}}_{n\,digits}+\underbrace{(888..8)}_{n\,digits}\]is equal to
A.	\[\frac{4}{9}{{({{10}^{n}}-1)}^{2}}\]
B.	\[\frac{4}{9}({{10}^{n}}-1)\]
C.	\[\frac{4}{9}({{10}^{2n}}-1)\]
D.	\[4({{10}^{n}}+1)\]
Answer» D. \[4({{10}^{n}}+1)\]

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The sum \[\underbrace{{{(666..6)}^{2}}}_{n\,digits}+\underbrace{(888..8)}_{n\,digits}\]is equal to

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