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9 = ar^1
U6 = ar^6-1
729 = ar^5
rasio
ar^5/ar^1 = 729/9
r^4 = 81
r = akar pangkat 4 dari 81
r = 3
cari a
ar^1 = 9
a3^1=9
a.3 = 9
a=9/3=3
S4 = 3(3^4-1)/(3-1)
S4 = 3(81-1)/2
S4 = 3(80)/2
S4 = 240/2
S4 = 120