Finding a solution to a recurrence relation

[@justinwang787]

bruh my brain hurts

[@certifiedholisticchic]

same

[@sammyschulman9552]

yo the intro issa banger

[@laurenlin2]

thank you for explaining the (n(n+1))/2 part. My teacher would keep jumping to that conclusion without explaining how she got there so I got confused on the logic.

[@pikaphillip]

i see now, thank you