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r = 27/81 = 1/3
Un = a.r^n-1
1/81 = 81 . 1/3^n-1
1/3^4 = 3^4 . 3^-n+1
3^-4 = 3^5-n
-4 = 5-n
n = 9
jadi banyak suku dalam barisan tersebut adalah 9
^ itu pangkat