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maka,
U3=ar^2 = 12
U5=ar^4 = 48
ar^4 / ar^2 = 48 / 12
r^2 = 4
r = 2
a(2)^2 = 12
a = 3
jadi, U7 = ar^6
U7 = (3)(2)^6
U7 = 192
u3 = ar^2
ar^2 = 12
u5 = ar^4
ar^4 = 48
ar^2.r^2 = 48
12r^2 = 48
r^2 = 48/12
r^2 = 4
r = √4
r = 2
u3 = ar^2
a = (u3)/r^2
a = 12/2^2
a = 12/4
a = 3
u7 = ar^[7-1]
u7 = (3)(r^6)
u7 = (3)(2^6)
u7 = (3)(64)
•> u7 = 192