11. The value of the $\operatorname { sum } \Sigma n = 113 ( i n + i n + 1 )$, where $i = \sqrt { } ( - 1 )$, equals: (A) i (B) $\mathrm { i } - 1$ (C) - i (D) 0
11. The value of the $\operatorname { sum } \Sigma n = 113 ( i n + i n + 1 )$, where $i = \sqrt { } ( - 1 )$, equals:\\
(A) i\\
(B) $\mathrm { i } - 1$\\
(C) - i\\
(D) 0\\