underset(x to 1)"Lt" (x+x^(2)+...+x^(n)-...

`underset(x to 1)"Lt" (x+x^(2)+...+x^(n)-n)/(x-1)=`

A

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

B

`(n+1)/(2)`

C

`(2)/(n)`

D

n

Verified by Experts

The correct Answer is:

A

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