Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 12 - Section 12.2 - Arithmetic Sequences - 12.2 Exercises: 3

Answer

True.

Work Step by Step

See p. 855, Partial Sums of an Arithmetlc Sequence ... the nth partial sum is given by either of the following equivalent formulas: 1. $S_{n}=\displaystyle \frac{n}{2}[2a+(n-1)d]$ 2. $S_{n}=n(\displaystyle \frac{a+a_{n}}{2})$ --------------- Formula 2 : the nth partial sum is the average (arithmetic mean) of the first and list terms, times n. True.
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