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ar² = 12
U6 = 96
ar⁵ = 96
U6 : U3
ar⁵ : ar² = 96 : 12
r³ = 8
r = 2
Terus masukin ke ar² = 12
a . 2² = 12 => a = 3
S1 = 3 (2¹ -1) : 2-1
= 3