Answer
See below.
Work Step by Step
$S_1:3$ is a factor of $1^3-1=1-1=0$, thus this is true
$S_2:3$ is a factor of $2^3-2=8-2=6$, thus this is true
$S_3:3$ is a factor of $3^3-3=27-3=24$, thus this is true
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