#### Answer

$29$

#### Work Step by Step

For $n=16$; we have $a_{16}=1+17(-3-1)=-59$
and
For $n=18$; we have $b_{18}=3+17(8-3)=88$
Thus, $a_{16}+b_{18}=-59+88$
or, $a_{16}+b_{18}=29$

Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$29$

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