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4 / 32 = r³
1/ 8 = r³
r = 1/2
U3 = ar²
32 = a (1/2)²
32 = a / 4
128 = a
U1 = 128 dan r = 1/2
ar^2 = 32
a.1/2^2 = 32
1/4a = 32
a = 128
u6 = 4
ar^5 = 4
ar^2 . r^3 = 4
32 . r^3 = 4
r^3 = 1/8
r = 1/2