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U3=18
ar pangkat n-1 =18
2r pankat 3-1 =18
2r pangkat 2 =18
r pangkat 2 = 18/2
r pangkat 2 =9
r = 3
U5=2X3pangkat 5-1
= 2 x 3 pangkat 4
= 2 x 81
= 162
U3=ar^2=18
=2.r²=18
r²=9
r=3
U5=ar^4
=2.3^4
=162