Arithmetic Series - Proof of the Sum Formula for the First n Terms

[@Konnoisseur]

Clear and succint. The best explanation of this maths formula on youtube

[@makita3680]

By far the most elegant proof.

[@cookiemonster4118]

amazing, thank you. Ive been trying to understand other videos for an hour, but I didnt. This one makes perfect sesnse.

[@photonicsauce7729]

Dang!! Why is the proof so neat!! nice video!

[@elnycohn2170]

clearest explanation i have found. thank you.

[@JadeGoodi]

Thank you so much, best explanation on youtube

[@ryousaf9644]

excellent video Ron

[@sumitra8687]

thanks sir it really helped me in my board exam. ☆Happy☆ 😇

[@enoliaqueeny7576]

Amazing sir

[@thisvidisretarded]

Thanks I really wasn't to sure about the proof and questions like these come up alot at alevel.

[@akshaynarayan160]

watching this after a-level edexcel paper 1 2022 be like..

[@natashakowalewski7179]

This is great, I visited waldomaths and I see you've done a geometric version. I'm creating a playlist for my students to watch in youtube, is it at all possible to have that geometric version video in youtube too? I'd appreciate it.

[@inception123able]

How can it be n-2? If any term is defined as a+(n-1)d

[@cool_frans]

Lol a bit late but n in this case n is the total terms you are adding together for example if you are adding 7 different terms together 3rd last would be [a+(7-3)d] and then add second last [a+(7-2)d] etc

[@cool_frans]

Other then that Tn = [a+(n-1)d] where n is any term number

[@rachelpeck53]

you sound like stephen fry.

[@CandiceCandy-vz6me]

Is this guy still alive

[@abdikaadirnasir]

Thats what I was thinking about 😢

[@patrick07124]

probably died of covid