Answer
$S_{10}=55$
Work Step by Step
Using $S_n=\dfrac{n}{2}(2a_1+(n-1)d)$, the sum of $
1,2,3,...,10
$ is
\begin{array}{l}
S_{10}=\dfrac{10}{2}(2\cdot(1)+(10-1)(1))\\\\
S_{10}=5(2+9)\\\\
S_{10}=55
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 11 - Section 11.4 - Partial Sums of Arithmetic and Geometric Sequences - Exercise Set - Page 658: 9
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