Jawabanmu

2014-03-03T21:19:25+07:00
Sn = a(r^n - 1)/(r - 1)

S3 = a(r^3 - 1)/(r - 1) = 63. .

a x ar x ar^2 = 1728. .

sederhanakan ...

a = 3
r = 4

suku2nya adalah = 3, 12, 48