Answer
$144$
Work Step by Step
1. We can identify the sequence as arithmetical with $a_1=1, d=2$
2. We have $\sum_{j=1}^{12}(2j-1)=\frac{12}{2}(1+2(12)-1)=144$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 11 - Further Topics in Algebra - Summary Exercises on Sequences and Series - Exercises - Page 1038: 23
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