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A = 81
R = u2 : u1 = 27/81 =1/3
A. Un = a.r pangkat n-1
Un = 81 . 1/3pangkat n-1
B.u8 = 81. 1/3pangkat8-1
U8 = 81 x 1/2178
U8 = 81/2178 = 27/729 = 9/243 = 3/81 = 1/27
Jadi u8 = 1/27