#### 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:
$a_4=a_3+a_2+a_1=1+1+1=3$
$a_5=a_4+a_3+a_2=3+1+1=5$

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$a_1=1$
$a_2=1$
$a_3=1$
$a_4=3$
$a_5=5$

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