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Sehingga, hasil dari deretan tersebut :
r = (U₂ / U₁ )
= ( 6 / 3 )
= 2
Maka
Un = αr ⁿ⁻¹
192 = 3 . 2 ⁿ⁻¹
2ⁿ⁻¹ = ¹⁹² / ₃
2 ⁿ⁻¹ = 64
2 ⁿ⁻¹ = 2⁶
n = ⁶ ⁺ ¹
n = 7