Find the Sum of the First N Terms of the Sequence

Multiple Choice

Find the sum of the first n terms of the sequence.
- $- 1 , - 3 , - 9 , \ldots ; \mathrm { n } = 12$

A) $- 265,720$
B) 797,161
C) $- 797,161$
D) $\frac { 797,161 } { 2 }$