What is the sum of the infinite series n squared divided by 2 to the n? I present 3 different solutions!

Yes this is a re-upload. @Marco12388 alerted me to a typo in the original upload around 2:20 where I skipped the 16 denominator by mistake. Original video:    • Series solved with increasingly advan...  

0:00 problem
0:42 important step
1:35 high school
3:16 college
7:03 genius level

Quora answers by Trevor, Aryan Arora, Alexey Godin
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Convergence
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