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a(1+r)=6
1+r=6/a
s4=a+ar+ar^2+ar^3=6+ar^2(1+r)=30
6+ar^2.6/a=30
6+6r^2=30
r^2-4=0
r=2 atau r=-2(Tidak Memenuhi)
a(1+r)=6
a=2
u10=ar^9=2.2^9=1024