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u3=12
ar^2=12
3r^2=12
r^2=4
r=2
u5=ar^4
=3(2)^4
=48
----------- = r^2
u1=a
r^2 = 12/3
r^2=4
r=2
u5=ar^4
u5=3.2^4
u5=3.16
u5=48