Question

In the sigma notation of a geometric series, ∑nn=1arn−1
, what is a?

Option #1: common ratio

Option #2: first term

Option #3: number of terms

(1 point)
The best answer to the question is Option #

Answer 1

In the sigma notation of a geometric series, \( \sum_{n=1}^{N} ar^{n-1} \), the variable \( a \) represents the **first term** of the geometric series.

So the best answer to the question is **Option #2: first term**.