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500 kelipatan 3= 125.000.000
jumlah 189.000.000
a=402
b=3
Un = a + (n-1)b
498 = 402 + (n-1)3
498 = 402 + 3n - 3
498 = 3n + 402 -3
3n = 498- 399
3n = 99
n = 33
Sn = n/2 (a+Un)
S33 = 33/2 (402 + 498)
= 33/2(900)
= 33(450)
= 14.850
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