Answer
Doesn't make sense.
Work Step by Step
A geometric sequence is where the ratio of consecutive terms is constant, which here applies, it is $2$ thus the sequence is geometric.
The sum of the first $n$ terms of an arithmetic sequence can be obtained by the following formula: $\frac{n(a_1+a_n)}{2},$ where $a_1$ is the first term, $a_n$ is the nth term and $n$ is the number of terms.
Thus the statement doesn't make sense, because that formula can be used to sum terms of an arithmetic sequence, but here we have a geometric sequence.
