Answer
The Ratio Test
Work Step by Step
When the positive terms of a series involve factorials, it is advisable to use the Ratio Test because when computing a ratio of consecutive terms a lot can be simplified/cancelled out.
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Chapter 8 - Sequences and Infinite Series - 8.5 The Ratio, Root, and Comparison Tests - 8.5 Exercises - Page 647: 5
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