Find the General Term, An, of the Given Geometric Sequence $7,49,343 , \ldots$

Multiple Choice

Find the general term, an, of the given geometric sequence.
- $7,49,343 , \ldots$

A) $a _ { n } = 7 ^ { n - 1 } + 6$
B) $a _ { n } = 7 n + 1 - 42$
C) $\mathrm { a } _ { \mathrm { n } } = 7 \mathrm { n }$
D) $a _ { n } = 7 + 42 ( n - 1 )$