Answer
$a_1=1$
$a_2=1$
$a_3=1$
$a_4=3$
$a_5=5$
Work Step by Step
We are given:
$a_{n}=a_{n-1}+a_{n-2}+a_{n-3}$
And:
$a_1=1$
$a_2=1$
$a_3=1$
We evaluate:
$a_4=a_3+a_2+a_1=1+1+1=3$
$a_5=a_4+a_3+a_2=3+1+1=5$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 8, Sequences and Series - Section 8.1 - Sequences and Summation Notation - 8.1 Exercises - Page 600: 20
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