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A) \[\frac{4}{9}{{({{10}^{n}}-1)}^{2}}\]
B) \[\frac{4}{9}({{10}^{n}}-1)\]
C) \[\frac{4}{9}({{10}^{2n}}-1)\]
D) \[4({{10}^{n}}+1)\]
Correct Answer: C
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