Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 11 - Further Topics in Algebra - 11.1 Sequences and Series - 11.1 Exercises: 43

Answer

$3$

Work Step by Step

$\sum ^{6}_{k=1}\left( -1\right) ^{k}\times k=\left( -1\right) ^{1}\times 1+\left( -1\right) ^{2}\times 2+\left( -1\right) ^{3}\times 3+\left( -1\right) ^{4}\times 4+\left( -1\right) ^{5}\times 5+\left( -1\right) ^{6}\times 6=\dfrac {65}{}+4-3+2-1=3$
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