Jawabanmu

2014-01-31T21:17:33+07:00
Jawabannya 30

Sn = n/2 { a +Un } = 4275
> 50/2 { (2x+1) + (2x+50) } = 4275
> 25 { 4x + 51 } = 4275
> 100x + 1275 = 4275
>100x = 4275 - 1275
>100x = 3000
>x = 30