If Z is a positive integer greater than 1, what is the sum of the multiples of Z from Z to Z^2, inclusive?	Pick one:
A) Z(Z + 1)(Z-1) B) Z^2(Z + 1)/2 C) Z^2(Z-1) D) (x^3 + 2x)/2 E) x(x-1)^2
Ans :- B=Z^2(Z + 1)/2   I substituted 3 in all answer choices.   Option B and C were both satisfying the condition.   So i substituted 4 instead of 3 in all answer choices,   Only Z^2(Z + 1)/2 option satisfied.
<result>B</result>
If Z is a positive integer greater than 1, what is the sum of the multiples of Z from Z to Z^2, inclusive?