Answer
See below.
Work Step by Step
$S_1:2$ is a factor of $1^2-1=1-1=0$, thus this is true
$S_2:2$ is a factor of $2^2-2=4-2=2$, thus this is true
$S_3:2$ is a factor of $3^2-3=9-3=6$, thus this is true
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.