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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(n+1)(2n+1))/(6)`

C

`(n^(2)(n+1)^(2))/(4)`

D

none

Text Solution

Verified by Experts

The correct Answer is:
A
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