Work Step by Step
$a_1=1=2-1=2+(-1)^1$ $a_2=3=2+1=2+(-1)^2$ $a_3=1=2-1=2+(-1)^3$ $a_4=3=2+1=2+(-1)^4$ $a_5=1=2-1=2+(-1)^5$ We can conclude that $a_n=2+(-1)^n$
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