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51 = 6a + 15b
sederhanakan => 17 = 2a + 5b
S9 = 9a + 36b
117 = 9a + 36b
sederhanakan => 39 = 3a + 12b
eliminasikan
39 = 3a + 12b ( x 2)
17 = 2a + 5b (x 3)
sehingga
78 = 6a + 24b
51 = 6a + 15b -
27 = 9b
27 : 9 = b
3 = b
suku awal atau a
2a + 5b = 17
2a + (5 x 3) = 17
2a + 15 = 17
2a = 17-15
2a = 2
a = 1
U3 = a + (3-1)b
U3 = a + 2b
U3 = 1 + (2 x 3)
U3 = 1 + 6
U3 = 7