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U₄ = a. r³ = 81
U₆ = a. r⁵ = 729
Ditanya: Suku Ke-2 (U₂)?
Dijawab:
r⁶⁻⁴ = U₆ / U₄
r² = 729 / 817
r² = 9
r = √9 = 3
U₄ = a. r³ = 81
a. 3³ = 81
a = 81 / 27 = 3
Un = a. rⁿ⁻¹
U₂ = 3. 3²⁻¹ = 9
*Keterangan : a = Suku Pertama
r = Rasio