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Find the sum of the following series: `5+55+555+ to n t e r m sdot`

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Find the sum of the following series: `5+55+555+ to n t e r m sdot`
A. `(5)/(9)[(10)/(9)(1-10^(n))-1]`
B. `(5)/(9)[(10)/(9)(10^(n)-1)-n]`
C. `(5)/(9)[(1)/(9)(1-10^(n))-10_(n)]`
D. none of these
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Correct Answer - B
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