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8. 88
9. 130
Semoga membantu
u6 = 18
u3 = 3
beda = 6-3 = 18-3
beda = 3 = 15
beda = 5
suku pertama (a) = 3 - 2b
a = 3 - 2×5
a = 3 - 10
a = -7
ditanya U20
Un= a+(n-1)b
U20 = -7 + (19 × 5)
U20 = -7 + 95
U20 = 88 => C