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Verified answer
Jawabu5 /u3 = 27/3
r^2 = 9
r = 3
u3 = 3
ar^2 = 3
a (9)= 3
a = 1/3
un = a . r^(n-1)
un = 1/3 . 3^(n-1)
un = 3^-1 3^n . 3^-1
un = 3^n. 3^-2
un = 3^(n-2)
u8 = 3^(8-2) = 3^6 = 729