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U4 = ar³ = 18 ⇒ disubtitusikan ar³ = 18, a diganti dg 2/r
2/r . r³ = 18
2r² = 18
r² = 9
r = 3
nilai a = 2/r = 2/3
U5 = ar^4 = 2/3 (3)^4 = 2/3 . 3.3.3.3 = 54