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A = 6....maka s8 :
a ( 1 - r^n) / (1 - r) = s8
6 ( 1 - (1/3)^8) / (1 - 1/3) =
6 (1 - 1/6.561) / 2/3 =
9 ( 6.560 / 6561) = 6560/729
atau 8,9986