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1. U₁ = 50
U₄ = 400
r⁴⁻¹ = 400/50
r³ = 8
r³ = 2³
r = 2
U₅?
U₅ = arⁿ⁻¹
= 50×2⁵⁻¹
= 50×2⁴
= 50×16
= 800
jadi suku ke 5 adalah 800
2. U₁ = 36
U₂ = -12
r²⁻¹ = 36/-12
r¹ = -3
U₅?
U₅ = arⁿ⁻¹
= 36×-3⁴
= 36×81
= 2916
jadi, suku ke 5 adalah 2916
3. U₁ = 8
U₄ = 64
r⁴⁻¹ = 64/8
r³ = 8
r = 2
U₅?
U₅ = arⁿ⁻¹
= 8×2⁴
= 8×16
= 128
jadi suku ke 5 adalah 128