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b = 4
Un(terakhir) = 296
Un = a +(n-1)b
Un = 104 + (n-1)4
Un = 104 + 4n - 4
Un = 100 + 4n
296 = 100 + 4n
4n = 296-100
4n = 196
n = 196/4 = 49
Sn = n/2 (a+Un)
S49 = 49/2 (104+296)
S49 = 49/2(400)
S49 = 49 x 200
S49 = 9800