Answer
$21$
Work Step by Step
$\displaystyle \sum_{n=1}^{6}n=1+2+3+4+5+6$
$=21$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
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 Examples 5 and 6 - Page 797: 13
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