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ar^4/ar = 54/2
r³ = 27 = (3)³ berarti r = 3
ar = 2 ⇔ 3a = 2 ⇔ a= 2/3
U4 = ar³ = (2/3)(3)³ = (2/3)(27) = 18
= 54
ar = 2 ---> a × 3 = 2 ---> a =
a = 54
2 × = 54
= 54 ÷ 2
= 27
r = 3
= a = × = 18