Formula for arithmetic series

[vanzypubg]

Lol for years... throughout my entire University life, I'm even in my Masters degree now...and whenever I falter on my math, I always think "consult Sal"...bcz he never disappoints. Thank you Sir...thank you for the As

[patcupo]

"Color changing is sometimes difficult." -Salman Khan

[sethvlogs]

im having a mental breakdown because of mid terms

[cancan]

Khan Academy is literally a life saviour

[ojk]

lol u explain it all in the end but until then im like wtf how am i gonna remember it.

[Voltronev]

Best explanation on the net - thanks again Khan Academy

[arrianmian]

Yeeeeah i got to 111th comment i am so proud of myself...but really the video explained way better then my teacher could in a week.

[Mirsab]

0:54 mind blown, now I know why it's n-1

[Debiprasad]

I keenly watch your videos.It is very nice of you that you have uploaded the video on derivation of sum formula of AP.More than a million students appearing for their class 10 exams this march 2013 in india will remain greatful to you.Thanks

[TheDrivenMind]

Same here, much easier to understand intuitively.

[SaadAhmad]

I honestly love you man! saved me at least 20 mins!

[kgadimoney]

Omg thank you soo much I understand this now

[TRADERSFRIEND]

Your brain is 3 times the size of the average human, thanks for simplifying things and helping me to muse my

[gustavlindell]

this was extremely helpful and understandable, thank you

[noel]

at 6:20 you said that it makes intuitive sense because you're increasing by the same amount every time, i dont see how thats intuitive but would really like to know. can someone PLEASE elaborate on how it is intuitive? thanks in advance!

[joyanntodd]

how do i find the sum of the next 18 terms and the sum of the first 18 term if im given an arithmetic progression ?

[SnoozeTheRecluse]

How do you predict the (for example) the 15th term?

[rebekahhynson]

what is n? and how do you figure out what it is?

[sowbhagyanaidu]

Hello!!could any body explain the solution...
If avijith saves rs.400 more each year than he did the year before and if he saves rs.2000 in the 1st year, after how many years will his savings be more than altogether?

[horlacsd]

always learned this w/ the anecdote of a 10 yr old Gauss, finding the sum of 1-100.