Find the General Term an of the Given Sequence $- 1,1,3,5,7 , \ldots$

Multiple Choice

Find the general term an of the given sequence.
- $- 1,1,3,5,7 , \ldots$

A) $a _ { n } = - 1 ( 2 ) ^ { n - 1 }$
B) $a _ { n } = 2 n - 3$
C) $\mathrm { a } _ { \mathrm { n } } = \mathrm { n } + 2$
D) $a _ { n } = 3 n - 2$