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Sn = a(r^n - 1)/(r - 1)
maka
S6n = a(r^6n - 1)/(r - 1)
= a((r^3n)² - 1²)/(r - 1)
= a(r^3n - 1)(r^3n + 1)/(r - 1)
S3n = a(r^3n - 1)/(r - 1)
maka,
S6n/S3n =
=
jawab : C