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u6= a.r^6-1 》486= a.r^5
18/486= a.r^2-2/a.r^5-2
1/27= 1/r^3 》27=r^3 》3= r
18=a.r2 》(masukkan r=3) 》 18=a.3^2
18=a.9 》(18÷9) 》 2= a
U8= a.r^n-1 》 2.3^8-1 》 2.3^7 》 2.2187
hasilnya= u8=4374