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U6 = a x r^5
U4 = a x r^3
U6 : U4 = r^2
sehingga ....
r^2 = 4
r = √4
r = 2
U2 x U8 = 16
U2 = a x r = a x 2
U8 = a x r^7 = a x 2^7
a x 2 x a x 2^7
a^2 x 2^8 = 16
a^2 x 2^8 = 2^4
a^2 = 2^4 : 2^8
a^2 = 2^-4
a = √2^-4
a = 2^-2
a = 1/ 2^2
a = 1/4