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U5 = a x r^4 --> 162 = a x r^4
U5/U3 = ar^4 / ar^2
162 / 18 = r^2
9 = r^2
r = akar dari 9
r = 3
ar^2 = 18
a.3^2 = 18
a.9 = 18
a = 18/9 =2
U6 = a.r^5
= 2.3^5
= 2 . 243
= 486