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Kalau mencari Sn, pakai rumus U1+(n-1)b
U1=303
b=3
Un=399
Jadi, 303+(n-1)3=399
303+3n-3=399
306+3n=399
3n=399-306
3n=93
n=93/3
n=31
Sn=n/2(U1+Un)
Sn=31/2(303+399)
Sn=31/2 x 702
Sn=31 x 351
Sn=10881