Answer
See below.
Work Step by Step
$\sum\limits_{i=1}^na_i=a_1+a_2+a_3+...+a_n$, here $i$ is the index of summation, $n$ is the upper limit, $1$ is the lower limit.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Section 11.1 - Sequences and Summation Notation - Concept and Vocabulary Check - Page 828: 6
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