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r³= 64
r=4
rasionya adalah 4
U3=32
ar²=32
a(4²)=32
a=32/16
a=2
suku pertama 2
Un= ar^(n-1)
Un= 2(3^(n-1)
=2.3^n. 1/3
=2/3.3^n
= 2.3^n / 3