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ar^4 / ar = 27
r³ = 27
r = 3
U2 = ar
6 = a 3
a = 2
U1 = 2
ar^4 / ar = 27
coret a dan r^4 dengan r . sisa r^3
r^3 = 27
r = 3
ar = 6
a.3 = 6
a = 2