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a = 127
b = -8 (Dapat ditentukan)
Maka,
Un = a+(n-1)b
Un = 127+(n-1)(-8)
Un = 127+(-8n)+8
Un = 135 - 8n [C]
Bukti : N1 = 135 - 8n = 135 - 8(1) = 127
N2 = 135 - 8n = 135 - 8(2) = 135 - 16 = 119
N3 = 135 - 8n = 135 - 8(3) = 135 - 24 = 103