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U6 = U1.r^6-1 = U1.r^5 = 1,25 ............... 2
2 : 1 =
r^3 = 1/8
r = 1/2
U3 = U1.r^2 = 10
U3 = U1.1/4 = 10
U1 = 40
Jadi, U1 = 40, r = 1/2