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a = 8
r = 4/8 = 1/2
pola atau suku ke n
= ar^(n - 1)
= 8(1/2)^(n - 1)
r = 4/8 = 1/2
pola atau suku ke n
Un= ar^(n - 1)
= 8(1/2)^(n - 1)
U3=8.(1/2)^(3-1)
=8.1/4=8/4=2
Pola = Un=U(n-1) : 2