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Find the sum to n terms of the series ...

Find the sum to n terms of the series
11+ 102+1003+10004+… :

A

`((10^n-1)+n(n+1))/2`

B

`10/9(10^n-1)+n(n+1)/2`

C

`10^n+n^2-1`

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
B
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  7. Find the sum to infinity of the series 1+3x+5x^2+7x^3+oow h e n|x|<1.

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