September 2018 1 34 Report
Diketahui barisan geometri dengan besar suku kedua 12 dan besar suku keempat 108. Jika rasio positif, rumus suka ke-n barisan geometri tersebut adalah...
a. Un = 3 x 2^n-1
b. Un = 12 x 3^n-1
c. Un = 2 x 3^n-1
d. Un = 4 x 3^n-1

*^ = pangkat

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