Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 12 Sequences and Series - 12.1 Define and Use Sequences and Series - Guided Practice for Example 4 - Page 796: 6


$\displaystyle \sum_{n=1}^{20}5n$

Work Step by Step

From the first three terms, we note the pattern n-th term = $5n$, for n=1, 2, 3. Since the last term is $100=5(20)$, we conclude that it is the 20th term of the sum. Summation notation: $\quad \displaystyle \sum_{n=1}^{20}5n$
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