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Un = 198
198 - 102 = 96
n = 96 / 3 + 1
n = 33
Jadi suku terakhir adalah suku ke-33
b = 3
Sn = 1/2 n (2a + (n-1)b)
S33 = 1/2 . 33 (2.102 + (33-1)3)
= 1/2 . 33 (204 + 32.3)
= 1/2 . 33 (204 + 96)
= 1/2 . 33 (300)
= 150 . 33
= 4950