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The sum to n terms of the series 9 + 99 ...

The sum to n terms of the series 9 + 99 + 999 + ……. Is

A

a) `10 (10^n - 1) -n`

B

b) `10 (10^n - 1) `

C

c) `10/9 (10^n - 1) - n`

D

d) `10/9 (10^n - 1)`

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