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S₂₀ = (a₁ + a₂₀)20/2 = 10(a₁ + a₂₀) = 10(5 + a₂₀) = 50 + 10a₂₀
80 = 50 + 10a₂₀
10a₂₀ = 80 - 50 = 30
a₂₀ = 30/10 = 3