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18 = a + 3b
U7 = a + 6b
33 = a + 6b
eliminasikan
33 = a + 6b
18 = a + 3b -
15 = 3b
5 = b
cari suku awal atau a
18 = a + 3b
18 = a + (3 x 5)
18 = a + 15
18-15 = a
3 = a
Sn = n/2 (2a + (n-1)b)
S18 = 18/2 [(2 x 3) + (18-1)5]
S18 = 9 [6 + (17 x 5)]
S18 = 9 (6 + 85)
S18 = 9 (91)
S18 = 819