Use the Formula for the General Term (The Nth Term) $a _ { 6 }$

Multiple Choice

Use the formula for the general term (the nth term) of a geometric sequence to find the indicated term of the sequence with the given first term, a1, and common ratio, r.
-Find $a _ { 6 }$ when $a _ { 1 } = 3200 , r = - \frac { 1 } { 2 }$ .

A) 100
B) $- 100$
C) $- 50$
D) $- 10$