#### Answer

e)

#### Work Step by Step

The given expression is the sum of the first three elements of a sequence, which can be also written as: $a_1+a_2+a_3=S_3$
The answer is e)

Published by
Pearson

ISBN 10:
0-32184-874-8

ISBN 13:
978-0-32184-874-1

e)

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