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Find the sum to n terms (i) 9 + 99 ...

Find the sum to n terms
` (i) 9 + 99 + 999 + …`
(ii) ` 0.2 + 0.22 + 0.222 + …`

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`(i) (1)/(9) (10^(n+1) - 9n - 10)`
(ii) ` (2)/(81) (9n - 1 + (1)/(10^(n)))` .
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