Suku kelima dan suku ketujuh dari suatu barisan geometri berturut turut adalah 162 dan 1458.suku ketiga barisan tersebut adalah....
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Verified answer
Barisan Geometri.ar⁶ = 1458
ar⁴ = 162
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r² = 9 → r = 3
a(3)⁴ = 162 → a = 2
Un = arⁿ⁻¹
U₃ = ar²
= 2(9) = 18