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U5 = ar⁴ = ⁴/₃
U5/ U2 = ar⁴/ar = (⁴/₃) / (¹/₆)
r³ = 8 --> r = 2
ar = ¹/₆ -> a = ¹/₁₂
s₂₀ = a(r²⁰ - 1) / (r- 1) = ¹/₁₂(2²⁰ -1)/(2-1)
= (2²⁰ - 1)/(12) = (1.048.576 - 1)/(12) = 1.048.575/12 = 87.381,25
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