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U2=12
U3=36
U4=108
U5=324
u6=972
u7=2916
u8=8748
jumlah 8 suku pertama = 13120
= ar^{5-1}
= 4r^{4}
324 = 4r^{4}
\frac{324}{4} = r^{4}
81 = r^{4}
3 = r
- - - jumlah 8 suku pertama - - -
tex] S_{8} = 4374 [/tex]