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r = 2
suku pertama
6/2 = 3
u9= a.r^8
= 3.2^8
= 768
U5 = ar pangkat 4 = 48 ... (2)
U5/U2 = 48/6
ar pangkat 4 per ar = 8
r pangkat 3 = 8
r = 2
U2 = ar = 6
2a = 6
a = 3
U9 = ar pangkat 8
= 3 x 2 pangkat 8
= 3 x 256
= 768