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a.)
Dengan,
a = 1
r = 3
Sn' = 121
Maka,
Sehingga,
n = ar⁵⁻¹
n = 1(3)⁴
n = 81
b.)
Dengan,
a = 4
r = 2
Sn' = 4092
Maka,
Sehingga,
n = ar¹⁰⁻¹
n = ar⁹
n = 4(2)⁹
n = 4(512)
n = 2048