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U3= 135
U5=…?
Un = a x r pangkat n-1
U3= 15 x r pangkat 3-1
135 = 15 x r pangkat 2
r pangkt 2 = 135/12 = 9
r = √9 = 3
U5 = a x r pangkat n-1 = 15 x 3 pangkat 5-1=15 x 81 = 1.215