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n= Un = bil terakhir kelipatan 3 sebelum 500 yaitu = 498
b = 3 --> karena kelipatan 3
Un = a + (n - 1) x b
498 = 402 + (n - 1)3
498 = 402 + 3n - 3
498 = 3n + 399
3n = 498 - 399
n =
= 33
Sn = x (a + Un)
S33 = (402+498)
= x 900
= 33 x 450
= 14.850