Answer
$\sum_{k=1}^{n}\frac{n-k+1}{k!}$
Work Step by Step
1. Rewrite the first term as $\frac{n}{1!}$
2. We can express the original summation as:
$\sum_{k=1}^{n}\frac{n-k+1}{k!}$
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
Published by
Cengage Learning
ISBN 10:
0-49539-132-8
ISBN 13:
978-0-49539-132-6
Chapter 5 - Sequences, Mathematical Induction, and Recursion - Exercise Set 5.1 - Page 243: 52
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