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S831= (831/2)*(1+831)=345696
jadi 1+2+3+...+831=345696
un: u1 + (n-1) x B
n : un - (u1 - b )
_____________
b
sn: n x (u1+ un)
__
2
un suku terakhir
n banyaknya suku
sn hasil
b beda antara suku
u1 suku pertama