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a = 2/r
U₅ = 2/27
ar⁴ = 2/27
2/r(r⁴) = 2/27
2r³ = 2/27
r³ = 1/27
r = ∛1/27
= 1/3
U₁ = 2/r
= 2
1/3
= 6
suku pertama adalah 6