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u(4)=a+(n-1)b
27 = a+(3)108
27 = a+324
-297=a
u(8)=a+(n-1)b
=-297+(7)108
=-297+756
=459
ar^3 = 27
ar^5 = 243
bagi U5 dgn U3 maka
r²=9 maka r=3 dan a=1
U8=1*3^7=2187
jadi suku ke-8 adalah 2187