lim(xto1) (sum(r=1)^(n)x^(r)-n)/(x-1) is...

`lim_(xto1) (sum_(r=1)^(n)x^(r)-n)/(x-1)` is equal to

A

`(n)/(x)`

B

`(n(n+1))/(2)`

C

`1`

D

0

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The correct Answer is:

B

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