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Un = a . (r pangkat n-1 )
= a . (2 pangkat n-1 )
b. 3072 = 3 . (2 pangkat n-1 )
3072 : 3 = 2 pangkat n-1
1024 = 2 pangkat n-1
2 pangkat 10 = 2 pangkat n-1
10 = n - 1
n = 9 ------> Un = U9