Find the sum to infinity of the series ....

Find the sum to infinity of the series .
`(i) 1+ (2)/(11) + (3)/(121) + (4)/(1331) + … + n((1)/(11))^(n-1) + … `
(ii) ` 1 + (4)/(7) + (9)/(49) + (16) / (343) +…+ n^(2) ((1)/(7))^(n-1) +…`

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