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a/u₁ u₂ u₃ u₄ u₅ u₆ u₇
2 , 4 , 8 , 16, 32, 64, 128
rasio(r) r = U₂ = U₃ = U₄ = Un
U₁ U₂ U₃ Un-1
Un = a.r n-¹
co : U₃ = 2.2³⁻¹
= 2. 2²
= 2.4 = 8