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ar^3 /ar = 9
r^2 = 3^2
r = 3
u2 = ar
6 = a (3)
a= 2
s9= a (r^n -1) / r-1
s9= (2) ((3)^9 -1) / (3) -1
s9= 3^9 -1
s9= 19683 -1 ==> 19682
tanda (^) artinya pangkat yaaa