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a = 204
b = 4
Un (terakhir) = 296
Un = a + (n-1)b
Un = 204 + (n-1)4
Un = 204 + 4n - 4
Un = 4n + 200
296 = 4n + 200
296-200 = 4n
96 = 4n
96 : 4 = n
24 = n
Sn = n/2 (a+Un)
S24 = 24/2 (204+296)
S24 = 12 (500)
S24 = 6.000 (B)