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U7=3/16
Permisalan U3= a x r^2
U7 = a x r^6
a.r^6/a.r^2 = 3/16 x 1/3
r^4 = 1/16
r = 1/2
a.(1/2)^2 = 3
a. 1/4 = 3
a = 12