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Verified answer
Barisan dan DeretMatematika
Kelas X SMA
Kurikulum 2013
a = 1/2
r = 1/3 x 2/1
r = 2/3
Un ⇒ 1/2 x (2/3)^n - 1 = 32/729
(2/3)^n - 1 = 64/729
n - 1 . log (2/3) = log (64/729)
n - 1 = log (64/729)/log (2/3)
n - 1 = 6
n = 7 (C)
Semoga Membantu!!!
(2/3)^(n-1) = 64/729
(2/3)^(n-1)= (2/3)^6
maka n-1= 6
n = 6 + 1
n = 7