Saved Bookmarks
| 1. |
Derive all formulas of Sn |
|
Answer» Sn= n/2【2a +[n-1]d】 Yaani ki hum Sn= n/2【a+a+(n-1)d】kah sakte hai Yaani ki Sn =n/2 {a+l}. {{{a+(n-1)d=l=An Sn=n/2(a+an)orSn=n/2(a+l) Write from 1st term....and write ap from last term.....and add them... You will get it? Sn=n/2(2a+(n-1)d)Sn=n/2(a+l) |
|