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u4?
a) a=2 ; u5=162
ar^4=162
2r^4=162
r^4=162/2
r^4=81
r=3
u4=ar^3
2.3^3
2.27=54
b)a=4 ; u3=64
ar^2=64
4r^2=64
r^2=64/4=16
r=4
u4=ar^3
4.4^3=4^4
=256