Answer
$a_1=-1$
Work Step by Step
Substituting $n=1$ into the equation $
a_n=\dfrac{(-1)^n}{n}
$ results to
\begin{array}{l}
a_1=\dfrac{(-1)^1}{1}
\\\\
a_1=-1
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 11 - Section 11.1 - Sequences - Vocabulary, Readiness & Video Check - Page 638: 5
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