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U5 =>ar^4 = 162
(ar^2) r^2 = 162
18. r^2 = 162
r^2 = 162/18
r^2 = 9
r =3
Untuk r = 3
maka ar^2 = 18
a. 3^2 =18
9a = 18
a = 2
U8......?
U8 = ar^7
= 2. 3^7
= 2. 2187
= 4374 D