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r = 3 dan , sehingga diperoleh:
S6 = a (3^6 - 1) / 3 - 1 = 3640
S6 = a (729 - 1) / 2 = 3640
a (728) / 2 = 3640
a (364) = 3640
a = 3640 / 364 = 10
jawabannya: 10
ket:
^ (pangkat)
/ (per / pembagian)