Answer
$a_n=(-1)^n$, $n=1,2,3,....$
Work Step by Step
Since, we have $-1,1,-1,1...$
This sequence shows an arrangement of alternate signs.
which can be represented as:
$a_n=(-1)^n$, $n=1,2,3,....$
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 - Exercise Set - Page 831: 83
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