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suku ke 4 :
ar³ = 12
(3/2) x r³ = 12
r³ = 12 X 2/3
r³ = 4 x 2
r³ = 8
r = 2
suku ke 7 : ar⁶ = (3/2) x 2⁶ = (3/2) x 64 = 96