Answer
$a_n = (-1)^{n+1}$
Work Step by Step
The sequence is always 1 with the sign alternating, the sequence starts at n=1 which gives a -1 just like the sequence in the problem.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 10: Infinite Sequences and Series - Section 10.1 - Sequences - Exercises 10.1 - Page 569: 13
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