Answer
$3,1,3,1,3$
Work Step by Step
Given $a_1=3, a_n=-a_{n-1}+4$, we have:
$a_1=3$
$a_2=-a_{1}+4=-3+4=1$
$a_3=-a_{2}+4=-1+4=3$
$a_4=-a_{3}+4=-3+4=1$
$a_5=-a_{4}+4=-1+4=3$
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