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ar^9= 98
ar^6xr^3=98
12xr^3=98
r^3=98
r= akar 3 nya 98
r=2,0137
u10= ar^9 =98
u10/u7 = ar^9/ar^6 = r^3
r^3 = 98/12 = 49/6
r^3 = 8,1667
r = 2,0137