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9 , 6 , 1 , -6, ...
∨ ∨ ∨
b --> -3, -5, -7
∨ ∨
-2, -2
a = 9
b = -3
c = -2
Dit: = ...?
Jwb:
Jadi, suku ke-10 dari barisan aritmatika tersebut adalah -90