Find a Formula for the N Th Term of the Geometric

Multiple Choice

Find a formula for the n th term of the geometric sequence. Assume that n begins with 1. $a_{1}=10, a_{2}=2$

A) $a_{n}=10\left(\frac{1}{5}\right) ^{n-1}$
B) $a_{n}=2^{n-1}$
C) $a_{n}=2(5) ^{n-1}$
D) $a_{n}=2(5) ^{n}$
E) $a_{n}=10\left(\frac{1}{5}\right) ^{x}$