MathNet 2016-part-05 — 184 problems (EN–VI) Question 117

What is $1+3.5+6+8.5+\ldots+2501$, if the difference between consecutive terms is constant?

(A) $1249750$
(B) $1251000$
(C) $1251750.5$
(D) $1252251$
(E) $1253502.5$