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5. ar² = 4/3
ar⁵ = 32/81
ar⁵/ar² = 32.3/81.4
r³ = 8/27
r = 2/3, maka a= (4/3).(9/4) = 3
Sn = a/(1-r)
= 3/(1-2/3)
= 9.......opsi A